So I was 152 at the begging of the summer and now I am 174. I do not know why I am gaining so much weight. I went to the doctor two weeks ago and I was 166.8 and I have been walking and cut out soda, bread, fruits etc. and now only eat eggs, cheese, and salads and drink water. Why am I losing so much weight? Also, I have been having bad head aches and under my arm pit there is a brown circle that has been there for a month.