Do talk with your GP. With anyone you think may help. Don't let it go.
Maybe, for now, you could dance to music and stretch in your room---or find someone to walk with/run with. Do try to push beyond the self-consciousness and fear and get out to exercise (maybe a bicycle) even if it is just a short walk a few times a day, anything at all is better than letting the fear trap you inside. Z is right, the sooner the better, and don't settle for those who don't understand. (((((()))))))) You can get through this, it won't be easy, or quick, but you have already clearly identified the problem. Let us know how it goes.