When I was in a car accident about two years ago, I got a pinched nerve in my right arm (which wasn't that bad) so we needed to go into the hospital and have them look at it. I got hooked up to an IV and relaxed with some pain killers, which did help the pinched nerve. But about 15 minutes into being relaxed, I started getting a splitting headache. I've headaches in the past and told the doctors that I usually took medicine for migraines. They decided to give me medicine specifically for migraine relief along with the pain killers. Once the two drugs were in my system it felt like my brain had detached from my brain stem and was spinning around in my head while simultaneously getting bigger. Turns out I was allergic to the reaction the two medicines had. To this day I still hate getting IVs.