I had some pressure in my head for a couple weeks and then my tooth started hurting and the pressure was gone. I, then had a root canal and everything was fine for a few days. They gave me clindamycin for the infection. After a few days my head started to have a burning sensation on the back and then it eventually reached back of my neck. The burning is now much less constant but now I get random kind of cold feeling in my chest and it would pop up in lower back and other parts of the body for a few seconds. I feel my feet more now when I sit down. My left hand is getting colder than usual. Please help.