Suggest Treatment For Cold With Sneezing, Severe Night Sweats And Breathlessness

Hello, I m concerned that i might have an infection or something. I have been sick for the past week. It started off as a allergy/cold with sneezing, stuffy and running nose. Then I started have severe night sweats. The heavy sweating was also during the day, but worse at night. I begin having shortening of breath when that happens also. For the past 3 days I have had a bad case of diarrhea, dizzy spells and still the shortening of breath. I have not be able to keep any food down for the past 3 days as well. I have been very tired. This concerns me because I completed a 2 year span of treatments for breast cancer this past February. Please if you can give me some idea of whats happening, I really would appreciate it.