I Had Lost A Great Deal Of Weight (more Than

I had lost a great deal of weight (more than 100 pounds over about 3 year period. I had maintained that loss within 5 pounds for 2 years. After a prethanskgiving party at my house I haven't been able to stop eating, suspect I have now gained between 20-40 pounds. I am having night sweats and hurt all over. I don't have the energy I had. One night I woke with the room spinning and in cold sweat with extreme nausia. Feel both physically and pyschologically miserable. Don't know where to go for help.