Keep a diary of what you eat (including ingredients in food) and drink to find a pattern to see if any particular food is making you worse so that you can then avoid it.
Avoid fatty and spicey foods and fizzy drinks and nothing fried. Make sure you drink plenty of fluids.
Have you had tests carried out on your digestive tract to rule out ulcers and halibacter pilori?
Tests for halibacter are done initially by blood test (first time only) and then by breath tests. If you have an ulcer, a biopsy would find out if this is caused by the Halibater Pilori bacteria and would have to be treated accordingly to get rid of the bacteria.
Best wishes
There are so many antiacids on the market it's hard to say which one will work for you. My doctor prescribed Omeprazole (Prilosec). It worked for a couple of weeks and then the GERD, Reflux and heartburn came back. I think I'll try apple cider vinegar and water next. I hear it really works.
I too was prescribed zantac (Ranitidine) and I began taking them last week for nausea and was having light chest pain.( Less serious Zantac side effects may include:headache (may be severe);drowsiness, dizziness;sleep problems (insomnia);decreased sex drive, impotence, or difficulty having an orgasm; or swollen or tender breasts (in men);nausea, vomiting, stomach pain; or diarrhea or constipation so yes those are some of the side effects your having. I have the chest pains, tender breasts and dizziness it ***** to.
Have a word with your doctor about this. It appears that the Zantac is not suiting you.
Read the Zantac label for any counterindications.