Stay hydrated. I found that to be the biggest aide to me and whwn I was dehydrated I felt the world coming to an end. The sweats would cause me to change my shirt at lunch. And co workers would question my change of clothes. I would say I spilled something during lunch. Its a truly awful feeling but again staying hydrated helped so much. And since you are chain smoking I am sure you are not hydrated well. Go get some electrolyte drink like pedialyte (not Gatorade as it has too much sugar) and pound one or even two of those a day for a few days. It helps me a ton.