I was recently put on Pepcid and Prilosec for GERD and ulcer-like symptoms. I don't know whether it was one or both medications, but I definitely had strange side effects. I felt tingling down my arms, mainly my left, headaches, neck pain, back pain and brain fog. I also felt and still feel a small vibrations in my fingers on my left hand and throat sometimes. I've been off both medications for almost two weeks now. Initially I stopped because the brain fog was too much. I had trouble concentrating, memory problems, and felt detached from everything. Like I was doing things but it didn't feel as if I was doing them. Plus the headaches I got. Almost like the vibration was in my head too. It was mainly towards the front of my head, my entire forehead felt like it was vibrating and tingling. Some days I couldn't take and started crying. As soon as I stopped the Prilosec the brain fog went away within a day. For a couple of days afterward I felt pretty good. But then some symptoms returned like the abdominal pain and heartburn. I try to control it now with diet but it's still hit or miss and I'm still getting neck pains, back pains and headaches. But now after reading several other threads I'm beginning to wonder if its from the heartburn and GERD.
I'm going in for the h pilori test next week. Hopefully more answers to come.
If you want to read about some serious side effects of from PPIs check out the peoplespharmacy.com and look under omeprazole . Some of their stories will give you chills.
Good luck and better health.