Thank you for your query at DoctorSpring.com
I understand your concern.
These kind of cramps could indicate either acute gastritis ( could be related to heartburn ) or colitis which is associated with such crampy pain and diarrhoea.
Since you do not have diarrhoea, it seems related to the reflux disorder.
I will request you to take Cap. Omeprazole 20 mg twice daily for 2 weeks and you can update me after 3 days. If the pain persists you can take Tab. Dicyclomine SOS for relief.