Do you feel anxious? Suffering irrational fears? Anxious people have anxiety, not just physical symptoms. A diagnosis of h-pylori is problematic, because it exists in everyone. In some, it gets entrenched and causes ulcers and their associated symptoms, while in most they just flow in and out. A therapist would not be able to tell you if it's psychosomatic. They can help if you truly are suffering from anxiety, but you don't sound like someone who is. Look, a wise soul once told me, if you do something associated with certain things and you get certain things, the most likely cause is doing those things. You went to Panama, a place associated with mosquitoes and water-borne diseases by virtue of climate and thus a lot of viruses and bacterial infections, and you came back with symptoms of that. I'd keep searching in that direction.