Leo123 gave a ton of great advice! This has helped me too. I've been reading Joel Osteen's motivational books and they have really been life-changing for me (sorry if that sounRAB corny, but it's true!). I just have to remeraber that everything happens for a reason and I have to go with the plan. I can't change my life plan God has for me. Worrying is actually wasting the time I could be spending doing something good for others.
Remeraber, it takes time to get to that happy place in life! Depression and anxiety do go hand in hand, with many different levels. I used to be depressed and anxious, then I felt that the depression was under control, but I'd still feel times when I just really had no motivation and joy and the anxiety would really get to me. I have been trying to schedule in little things here and there where I can do something FUN and relaxing. You need it!
I have taken up running. I've gotten in great shape and it's a great way to clear my mind and just run while listening to fun music. I also like to get regular pedicures and get my nails done. I can just sit and relax while getting pampered. It just makes me feel happy! For lunch breaks from work, I occasionally will take a good book with me and just go sit outside somewhere nice and read. It's a good escape from a stressful day in the office. I like funny books that let me escape from worrying and anxiety.
I try not to obsess about my health and just take good care of my body. I eat right and I exercise and watch out for anything abnormal. I just don't make it a conscious thought to look for things that could go wrong. I get tired a lot, so I enjoy the rush I get from anything with caffeine, so I guess it doesn't bother me for that reason. If I find myself worrying about anything or overthinking, I'll do something that makes me not think about it, like a sudoku puzzle. It lets me focus on something else and forget about it. I also like to play with my dogs with my fiance! The dogs always make me laugh. I also do take Prozac on a regular basis (it's been about a month and a half) and it's helped me too. I don't know if it's a coincidence, but the first day I started taking it, I felt a warm happy feeling out of nowhere. I don't always feel that way now, but I feel much better than before! I have made many improvements before Prozac, but I feel like it just put me a little more closer to how I want my life to be
Just take your time and make little changes as you can. It definitely takes time to be able to just sit and relax and enjoy things, but it's possible! I am finally getting there. It definitely doesn't mean that you will ALWAYS feel relaxed, because that likely won't happen for anyone, but the idea is that you can feel happy and relaxed at least a good portion of the time

Best of luck to you!