Move. Exercise outside. Do it every day. Don't even think about it. Prepare a Alarm and then you just go out and do it. Meet friends. Talk to them in REAL. Leave your Phone and Computers allone as long as possbile.<p>Wish you all the best.
Sorry to hear about this. If this is the first time you've felt this badly, I would recommend starting with your primary care doctor, they'll be able to help you coordinate the process of getting better.