My occi health doctor thought I might be depressed and advised that I should follow up with GP, he gave me a questionnaire to fill in and said I was bordeline depressed, as I take Amitriptyline for pain (it is used as an anti depressant as well).
I think it is common with everyone to feel down and looking forward seems to be the same endless checking and checking, bloods, weight, diet.
I think if you have a goal to aim for it makes life much easier, it could be as little as saying every lb in weight, I will put away a £1 and at the end of the year see how much money you have, or one I would love to do, run a marathon or half marathon, physically it's a no no but I can try to reach there by doing exercise a little at a time, keeps me busy for an hour at least.
I have also done the really p'd off smashing of crockery, I go to the charity shop, buy some ceramics and when I'm frustrated I go out the back and break them, all I need is some Greek music. I then spend an age sweeping up the broken pieces, it is a good stress buster.