Hi Laura, I went through the same things and to be honest I still have times like that. It sometimes helps me to just take a walk or do something different. It doesnt have to be strenuous, just to break the cycle and get your mind and body to make a change. I know how easy it is to focus on negative things too. Just a five minute walk around the park with my thoughts to myself were the first steps I took. Whatever negativity other people put to you, try not to take it on board. We all have problems so youre no different to anyone else. We all have good points too and you are no different there either. Sleeping a lot is a symptom of depression, just as you say, and I know it can be a lovely way to while away the boring reality of wake-time life. There is enjoyment to be found out there though, why not try something you used to enjoy, if only for five minutes?
Let me know how you get on :)
Mike.