Hi, I never get headaches and, effective 3 days ago, I have been getting severe headaches, neck pain, and body pain (feels like I ve been run over by a truck. ) I ve also been constipated and gassy (belchy, mostly.) I don t have a fever. I ve been getting mosquito bites for weeks, and thought I could have Zika? i just finished amoxicillin 500 mg tid (gum infection.) Any ideas?