Hello DeepSoft,
Acidity or reflux problems are very frequently caused by too much weight round the stomach which encourages hiatus hernia condition to exist.
Many years ago I had HH and took the doctor's advice to " lose some of that tummy" and it worked a treat.
If the acidity is mainly at night - leave longer period before retiring after dinner and raise the head of the bed.
When I was in the UK I remember taking Tums which worked beautifully; here I take Polysilane (Dimetilpolisiloksan, AI(0H)3, Mg(0H)2)which is better than anything I could find in the UK and for that wicked heartburn is a fantastic and immediate liquid solution. Google it if not readily available in the UK or elsewhere.
Good luck