If I didn't have my faith in God, this would be so much harder. I know that ultimately, He wins. You see evil all around you. Why? Because Satan exists. God is real and Jesus died for us, won the war, but the battles are still raging. If you don't believe in God, it's easy enough to meet Him. With a sincere and humble attitude, say a little prayer like this, 'God, I don't know if You exist. If You do exist, I want to know. I want to know the truth. Please reveal Yourself to me." Just be sincere, no flippancy or mocking.

As for the physical, get some exercise! It makes a world of difference. If you aren't used to being physically active, start simple, with walking. You can even walk around your house - inside or out. Just get moving. That will be the impetus to start doing more, like lifting weights. Especially if you're a man, lifting weights (within reason) is important and helpful and will build you up and give you confidence. Fixing those two, the Spiritual and the Physical will have an immediate beneficial effect on the Psychological. Best wishes.