I have noticed an increased problem with acid reflux since taking Flomax?

I had reflux issues when I was taking this med at bedtime , as instructed by a physician , despite the
Pharmacy Rx directions ( after a meal).
I now take it after my midday meal, so it will be out of my digestive system before I lie down to sleep, as being in a supine position aggravates reflux.

i too am having very bad acid reflux pain i have spoken to my doctor about this and he has proscribed medication lansoprazole 30mg and Gaviscon advance which partly seems to work

You should talk with your doctor. Gastric pain is a rare side effect of Flomax (Reflux - is not)
You may need to see a gastroenterologist.
See: https://www.drugs.com/sfx/flomax-side-effects.html