Whats wrong with me?

Lately i have been feeling a little out of it. I know i dont feel good just dont know what's wrong. When i eat i feel like puking it back up but nothing comes out. I feel really nausea before i eat and after.. i get a lot of headaches and my body temperature changes numerously & i have frequent backache as well..

I just dont know whats wrong. Could this be pre period sickness or something. Lol i dont know. Anyone felt like this?