welcome to HCM
I read carefully your concerns and I'd suggest as following:
1)start anti acids or PPI ( omeprazol) for your stomach pain and buscopan
2)avoid spicy foods, smoking, alcohol,coffee,tea.
It seems to be gastritis
associated with gastric functional problems (cramps).
If that is not enough please contact a gastroenterologist for further examination like upper endoscopy
and abdominal ultrasound
if you have any other concerns , please feel free to contact me.
All the best