i would question if you have the right doctor. it seems he wants you to will yourself well, but you can only do what you can. we are our best caregivers. so please do not think he knows more about your body than you do. do not overdo, but keep moving. that is waht i do. when it hurts, or you get dizzy, your body is telling you, you have done enough. also, you may be holding your breath a bit because you are scared and because you are on pain and that may be the cause of the dizziness.
take care of you, and tell your doctor you are doing your best, or better yet, get another doctor! joan