silverlining Were you given a lot of antibiotics after your gb op? Reflux can often be caused by something called SIBO (Small Intestine Bacterial Overgrowth) where the bad bugs in our gut get out of control. I have been battling it myself as SIBO is often at the root of gut and gallbladder problems, and it's quite hard to get rid of if it becomes entrenched. Reflux and heartburn are often symptoms of it. Don't be tempted to take Omeprazole as this makes SIBO a million times worse. You will get rid of one thing and gain a host more problems.
There are various alternative remedies if the reflux is bad. If it's just occasional, then Rennies or something similar are fine, but Omeprazole gets rid of stomach acid which is meant to be there to keep down the bad bugs. Too much stomach acid is not a good thing, but too little is even worse.
I use a homeopathic remedy called Natrum Phos 6x which works brilliantly. I don't know if I'm allowed to give a link to a stockist, but send me a PM if you want to know where to get it, or google it. It's also available online from that place with the name of a South American river 