You are a wonderful, warm and kind person and you write witty, insightful and sometimes outrageous posts which are brilliant anyway, you are never alone here on MN so don't think you are.
There. Feel better? Apart from heartfelt compliments, Michael McIntire or other great comedy, being kind to others will make you happy as will surrounding yourself with beauty.
Exercise (when you can) is brilliant even though you may find it hard to motivate yourself, even going for a short jog, instantly releases endorphins.
Also doing something you have put off for ages is good, or find difficult, because the sense of achievement increases the more difficult it is to achieve!