I had a tooth extracted two and a half weeks ago the area is swollen and painful and now i feel really sick i have cramps and pain all over and a feve?

You need to be seen: You probably have a dental abscess or perhaps flu on top of the local infection in the extraction site. You need hydration, temperature control and probably antibiotics.

2 evaluations: See your Dental Surgeon ASAP. You may have residual infection that needs additional treatment and antibiotics. Also see your General Practitioner, you may have influenza. Bottom line, you need to be evaluated to be treated.