My mom and dad... What's wrong with me? why can't I....?

A bit of back history, been married 22yrs, 2 kids, 18 and 16. I know my parents love me. But for some reason, for the last 22 when I've needed my parents help, for 95% of the time, I've had "bad timing".
Babysitting---guilt, and pressure to "come earlier". I was home almost 1 month after having my 1st child, who wasn't sleeping in the afternoon, and I thought I was doing something wrong..she finally "caved" ('oh alright') and would stand in my main floor foyer, waiting for me to finish my shower and "OK take me back to work". She owned her own travel business with my bro and dad. A business which, they babysat my 1st niece for a full year before my bro put her in day care. My eldest child is 4 mos younger than my bro's youngest...
Kids---my kids have been treated differently than my brother's. I don't mean, gifts. How do you explain to a 7yr old "why noni, makes us stand in the family room and only cooks with ___and ___". I knew then my kids were being treated different (as my grandmother did me and my bro), and at the very least my eldest knew that...at 7! My kids have "issues" my brother's kids have "growing pains", and go "thru phases".
Broke my leg 7mos preggers with my 2nd child, had to go to a rehab hospital for 3 weeks. To get stronger for crutches and to re-teach my leg to be dependant. (long story). I had been in a car accident and wore an external fixator for 5 mos, delivered my 2nd with it on. And was non weight bearing for 5 mos. I paid for babysitters for my eldest and then both children. My mil was wonderful, she gave me 1/2 of her time off! I asked my parents for 1 Sat month..They came 1 Sat, 1 time and told me "no more". They were going to have to get jobs because I couldn't pay for their now closed business' bills that were on our credit cards. (the 1st was 90 days past due the 2nd 10 days to collections). They never got jobs. My mom tho, took 1 week vacation for 3 yrs to watch my bro's kids in between summer sessions at the Boys' and Girls club. Would tell me that me and my kids couldn't come up to get the 4 cousins together... my kids were "too much"...I was going to STAY.
I was good enough to borrow 2 credit cards from for her travel business (that closed). (the status of those I noted above), my dh and I brought those cards current, paid them for 4 mos (2 before and 2 after I broke my leg). I was also good enough to live with for 30 days when they had no where else to go. But not good enough to sleep at on Xmas eve to watch my kids open their gifts Xmas morning..she did this with my brother for 5 years. One yr, they literally drove home in a blizzard instead of staying at my house.
Good enough to borrow money from, for groceries and when she bought her house. When I couldn't loan her money anymore I was told "you should help us as payback for all we did for you" (SWEAR to GOD my father said that to me) Good enough to trade a check with..I give her cash today, I can cash her check next week. Good enough to sit with her when my dad was in the ER all night and call in sick for the next night. Being an RN and alone with my dad for 4 hours (mom went home to shower), I asked her what their wishes were, she told me "ask your brother, he's executor of the will". My mouth fell open, I can't express how hurt I was...
A few years ago, my mom and I made "amends" I honestly thought I was over it. That I 'd put it behind me. I dropped my wall and opened up to asking them for help, and just being open. Of the 3 times I've invited them to just come to stay with us at the beach, she came 1 time. Each time not telling us she wasn't coming until about an hour before she was supposed to be there.
In Jan, I was super sick, my mom offered to take my eldest back to college for me. At first I said "nah I'll be ok"..then when I realized I wasn't have a hot flash it was a fever, I called back asking if I could take them up on their offer. After a useless circle of "can he go back earlier?" "how earlier, we all just woke up, I still have laundry to finish, what time works for you"... he said "just earlier" then he said 'never mind, 3 is fine we'll be there at 3". At 230 he calls (should be driving to my house), "we can't come we didn't nap after delivering the newspaper this morning." I said "well that would have been nice to know 2 hours ago, when I took you up on your offer. No problem, I gotta go" and I hung up. (I said 'good bye").
I mean there's more, but I thought these might be the "highlights"...
How do I keep current disappointment from pickin' scabs off the old ones? I REALLY thought I'd put the other stuff behind me.
How does anyone put 'stuff' behind them? Is it separated, current and old? or am I feeling normal? I mean I told my mom about the 22yrs of bad timing and now I hurt her. I didn't want to hurt her and I don't want to be hurt anymore..
Any advice would be helpful..PLEASE DON'T BASH.
Thank you

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