Hi there ~
I understand your concerns. An enlarged spleen
is not a cause of concern unless you are living in an area that is endemic to malarial or other contagious infection. I do not believe that if the mononucleosis
was the reason, it will last for a very long time. I also think that you have a history of gastritis
that is making you feel full with little meals and belch often. I hope you get treated with a GI specialist. A visit with an infectious disease doctor would also help.
I hope this helped and I wish you the very best. Take care!