HI ! Rarely such side effects may be possible with omeprazole
. To know if these are due to omeprazole, it is best to discontinue the drug for some time and see by yourself. If you are relieved, then it was due to the drug.However, you are advised to consult your treating doctor before embarking on this so that he may substitute this with some other medications for your hiatus hernia
Wish you an early recovery.