-Exercise (any amount is good but ideally you should get at least 30 min on most days),
-make healthy food choices (see http://www.hsph.harvard.edu/nutritionsource/what-should-you-eat/pyramid/) & practice good sleep hygeine (get enough sleep, go to bed & get up at the same time every day). Try to spend some time outside daily, especially when it is sunny! Also keep a journal-why? Because it is a tangible proof to yourself you've been here before and it ended..and it will this time if you bear with it!