I started with what I thought was a sinus infection but after 2 lots of antibiotics that didn't clear it up I went to a doctor again and he gave me puffers and I think prednisone for 7 days,that medication is gone. Now the systems I have right now are: severe headache,skin feels like it's burning and it's tender to the touch,cough,little appite, needs to be drinking a lot to keep from drying out. I also have a knot,I'm calling it in the calf of my right leg that showed up about the same time. Can you give me any idea of what's going on and what it is?