Yes , I think its common , it just happened to me yesterday , i felt like am having a severe low blood pressure and like am fainting with huge dizziness ! i felt my hands were getting numbed and i couldn't control myself no matter how hard i tried to breathe ! in fact it was getting worse when i tried to breathe ! it was so scary ! am desperate to have some kind of treatment , "implants , Injections , PRP ...." anything , but i live in the middle east , where ami going to find a good ENT ! am DOOMED ! :S