I stated taking Omeprazole about 4 or 5 days ago. I stated having chest discomfort, pain in my back,left and right arms, pain in the legs,neck pain, tingle in my finger tips on the left. These all happening at different times. My doctor said the same thing as some of the previous post that this drug was not the cause, I disagree! I previously had taken this drug and had the same problems some month ago but I forgot about the side effects. These side effect are considered as minimal or rare 2-9 % I will not be taking this drug again.