Suggest Treatment For Sore Throat, Constipation And Chest Pain

I have a sore throat that seems to stay with me (about four weeks now). I have been gaining about a pound a day. I have problems sleeping, my skin is very dry, I have muscle spasms a lot, and my balance is really off. In addition, I have been having problems with constipation and feeling short of breath with occasional irregular heartbeats and some slight chest pain. I started a yoga routine because I felt I wasn t getting enough exercise. I eat a healthy diet, do not smoke, and I seldom have an alcoholic drink. I normally never sweat very much, now lately I sweat a lot and sometimes feel chilled from sweating. I have had thyroid problems in the past, can it suddenly go crazy and cause a lot of these symptoms?