Brief Answer:
Duodenal ulcer is the first possibility
Detailed Answer:
Hi.
Noted your Medical history of mesenteric adenitis in childhood.
The pain is more in the morning, severe, in the upper abdomen, flares up every month, accompanied recently with a
chest pain, acid burn in throat and
body odor.
I would suggest in such a case the following investigation for the diagnosis and/ or to rule out the following way.
Upper GI
Endoscopy to start with to see if you have an ulcer in the stomach or duodenum and signs of healed/ old ulcer. It also shows the condition of the
esophagus.
Ultrasonography of the abdomen after a good preparation like giving charcoal tablets and dulcolax to clear the bowel a night before and to keep you nil orally after 10 pm the night before. This will help to diagnose problems of pancreas, liver and
gall bladder along with other organs and associated findings of lymph nodes and fluid or mass in abdomen.
If the sonography is suggestive of some positive findings , I would advise a CT scan to confirm the diagnosis.
It is good that your blood tests are clear; I would also go for a test of stool- routine and microscopy and for occult blood.
Pain after ejaculation may not be directly related to the present problem.
I hope this answer helps you to get a proper diagnosis , thereby helping to get the proper treatment for cure.