Headache relief?

Tiffany • This is my third pregnancy and we found out on October 14th that we are having fraternal twins due May 20th.
I just reached my 2nd trimester and I have had a severe headache for 3 days! I have taken Tylenol, had a massage, heating pad, drank ridiculous amounts of water, even tried caffeine. Nothing seems to help. Any advise on what else to try to relieve the pain?