I have been taking Losec for many years then was switched to Omep...

I have been taking Losec for many years then was switched to Omeprazole. My GERD has seemed to have worsened I always experance thirst, but the most worrying thing is that I get these choking attacks where I seem to be suddenly choking on nothing. It can happen any time not only when I am eating or drinking, even if I am resting quietly. I also experance a sudden increase in my heartbeat, at such a time my heart will suddenly and seemingly without cause start to pound this can continue for some time and leave me exhusted and often with a headache, these two last symtom accure together. Is there any one else with these symtoms (side effects)?