Still having pain in the area of my spleen after Mononucleosis

Still having pain and tightness in the area of my spleen after mono

It's been over 3 months since I was diagnosed with mono. I went to the hospital and my spleen was 14.9 cm instead of the normal 10 cm and my liver was also extremely swollen. After a month my liver readings were normal but my spleen was still enlarged so I continued to rest. The next month (so 2 months after being diagnosed) I went in for a second ultra sound and they said it was back down to normal so I could return to my normal activities as long as I felt okay.

I immediately returned to my heavy soccer lifting for college and my daily activities. After being cleared I still am having a tight feeling and pain where my spleen is like I did when I had mono. I notice it especially when I do abs on my left side and even sometimes when I am just walking. I don't sleep on my left side anymore because it still bothers me and I don't like any weight or pressure on my left side either. I decided to rest for the last two weeks to see if that will help and it hasn't. I just had an ultra sound last week to check my entire abdomen and it came back normal but I know something isn't right. Also all of my blood count tests were normal.

I understand it is impossible to diagnose things over the internet but my doctor is at a loss and I am just looking for any ideas or suggestions to help this situation. I am extremely frustrated and I want everything to be normal again but I don't want to further harm my health and I would like to know if working out is hurting it.

A side note: I had H.pylori two years ago and have since had bad heartburn and have been unable to eat a lot of good food since. The doctor doesn't think it's ulcers. (I"m not sure if this is important but I figure any medical history can help)
Other than that I am only 19 and I eat fairly well and I don't drink often so I would consider myself a healthy individual.