Thank you all for your replies.
Javery, I didn't think the two should be connected, but I can see what you mean about diet playing a big role. I went to a naturopath last year due to constant fatigue and she made me cut out a lot of things including certain carbs/grains and I felt so much better.
Sherrine, I do sometimes get sinus pain but I never have a runny nose? do I have to have a runny nose to get post nasal drip?
They didn't report a hernia so i'm assuming I don't have one. I think I will talk to my doctor about further testing like pH study and Barium swallow, thank you all again for your feedback.