Hi.
Thanks for your query and an elucidate history.
Since you have given a classical history of pain only once a day and that too when you wake up; and is related to the upper abdomen, the cause of this typical pain which is not sharp and appears as if someone is squeezing is most probably due to Colitis of the
transverse colon.
This is the part of the large bowel lying in the area you mentioned to have pain.
The pain is in the morning as it is normal to have the body-clock to cause the contraction of the large bowel (colon), to facilitate the passage of stool (bowel movement).
Hence you are getting the typical pain.
I would advise you the following:
Get a course of an antibiotic and
metronidazole,
probiotic for 5 days and see the results. If it cures up, you are fine.
If no relief, you have to undergo
colonoscopy and CT scan of the abdomen and
stool test to see whether there is an internal problem. The further treatment will depend upon the results of investigations.