My whole body s been hurting all day, in mostly my arms legs and lower back. My whole body feels hot to the touch but I feel cold. I went to the bathroom to pee and once I was done I felt a sharp pain In my stomache. Me and my boyfriend have had unprotected sex but I am on birth control, so I do not think I am pregnant. Also occasionally my whole body will feel super cold and I ll start shaking. What exactly could be going on with me? Tumors, cancer, pregnancy? I just want to know if I should go to a doctor. This has never happened before