Welcome to HealingWell. I am Kitt. Akram gave you good advice about exercising.
I would like to suggest you see your physician and get a good physical to make sure you do not have a medical issue going on. Be sure to talk with your physician about how you are feeling.
Another thing that may help you is
CBTThe MoodGym Training Programhttp://moodgym.anu.edu.au/welcomeCognitive-behavioral therapy is based on the idea that our thoughtscause our feelings and behaviors, not external things, like people, situations,and events. The benefit of this fact is that we can change the way we think to feel / act better even if the situation does not change.
This is a free online course and many members have used it.
Take care an again welcome to HealingWell.