There are cases in the literature (French study I believe) of an omeprazole-induced cough. You may want to try another PPI to see if that changes things around. PPIs aren't all alike.
I have the same problem which I, too, thought might be caused by Omeprazole. I did find, like CalGal, a link between Omeprazole and a cough, and it was also causing itchy skin down my spine area. Changing my PPI to Lansoprazole recently has not made the slightest difference, and I continue to cough all day and all night, a dry, irritating cough.
I also have gastritis, oesophagitis, a Hiatus hernia, none of which had been symptomatic other than nausea, and a lack of desire to eat. At the same time I was diagnosed with emphysema, which was blamed for all my symptoms regardless, until I eventually got someone to listen and I was given an endoscopy.
Thing is now. I just know after the battle I had to get someone to take my nausea as a separate illness, I know my emphysema will be blamed for the cough, when I am certain it isn't - it isn't that sort of cough. I don't know if it is the inhaler that I use for my shortness of breath. I gave up smoking also, at the same time as all these things were diagnosed, and use a nicorrette inhalator, so the cough could be connected maybe. I have too many options as to what it could be causing this cough, and not what it is.
A tube up my nose is NOT an option!
I have had my cough now for over 8 months!
Good Luck with yours . . .
Mentioned the cough today while I was at the doc's for something else, and he reckons Reflux (GERD) is the cause . . . we shall see. He did actually look through my notes, which makes a change, before he made the decision to go with that.
I did actually know that a cough can be the ONLY symptom with Refux. (I have never had heartburn as a symptom for my gasto probs)
Anyway, Domperidone and a raised bed are what I have been given. In a few weeks if there is no difference to the cough, we try something else.
Strangely enough, last night I did not cough, and have only coughed three times today . . . . . Hmmmm?!!