I have for many many months been awakened with a sensation of inner numbness on the left upper chest cavity, and a sense of fear and dizziness, and shaking. Am I having heart failure? I am on Chantix, and am down to about one to three a day, from 2 and a half packs a day, I have been smoking since age 15. The wierd thing is the attacks startetd when I became pregnant with my youngest Josephine who is now 6 months. They went away for a while, but returned the last two nights. Please, tell me Doc, what could these very weird numb sensations be???