Hi Moanybreeks and DeeMarie. Diarrhea cleared up so never found out if it was caused by food poisoning or the omeprazole. I haven't taken any more, the doctor did confirm though that these tablets can cause stomach upsets. My symptoms are just the same, (palpitations, pain, rumblings, belching) so I've now been prescribed Lanzoprasole. Will pick these up today and start taking tomorrow. I've been told to reduce the amount of carbs I eat and trying stopping gluten. It's the worry of not knowing the cause that's bothering me. I hate the palpitations. One doctor I spoke to mentioned I should get an endoscopy but I spoke with another on Friday and she said I should alter my diet, as that is how a hiatus hernia is dealt with. I have to see her in two to three weeks to see how things are going. (Well not actually 'see', it'll be a phone call!!)