Those happy feelings you are missing @Mo8409 will come back again for you - with time. For now, adjust and try to find some small moments of happiness in those little everyday moments. They may be brief, and may be difficult to feel, but they are still there.
@Mo8409 I once loved a million simple things. I am so sorry to see your having a hard time. You have a very positive personality. I honestly feel that with time you will be okay because of it.