I started taking Prilosec a few months ago and didn't notice any ...

I started taking Prilosec a few months ago and didn't notice any acute symptoms, but a week or so ago my pharmacy used a generic form of this ( Omeprazole) and I have been having debilitating headaches every day all day. I thought t was from my arthritis but it continues. Yesterday stopped taking Omeprazole to see if it will make a difference.I woke up today with a MAJOR headache. What I have been trying if 2 2mg Valium and some ibuprofen to see if this helps. At least it eases the pain. I have been taking Relpax (migraine pills) but after a while the headaches come back. This is so bad, guess I will have to go back to the doctor if this doesn't work. Anyone else having bad headaches too? Thanks for letting me let off steam.