Hi, I Just Came Back From Emerg And Had All

Hi, I just came back from emerg and had all emergency issues ruled out. I experience wave like pressure in my brain that last from 10 - 30 secs. about 1-5 minutes apart. As the day progresses, the get less harsh and longer time apart between episodes. I had a throat infection therefore I was prescribed an antibiotic. I noticed symptoms right away but tolerated the prescription until the third day. I woke up and was so weak, I could barely move as these wave like pressure episodes were happening. ECG is fine, bloodwork for electrolytes are fine, blood sugar is fine, blood pressure never a problem. I do have fybromyalga and have migraines. I also had a car accident in 2008 which caused Whiplash 2 and caused me to lose feeling in my body due to blood flow lessened to the brain. Ive experienced this the same way, the same time. Usually last for 24-48 hours after first wave of pressure.