18 Year Old Experiencing Troubling Symptoms! Please Help!

About 1 year ago, I had a pretty bad case of mononucleosis. My liver was involved among other things and I was down for the count for a few weeks after a couple doctor's appointments. I've had a weaker immune system since, but nothing I couldn't deal with, although it was accompanied by a strong anxiety that I've been battling my entire life. Ever since then, many lymph nodes have either remained or appeared on my neck, groin, and apparently in my abdomen according to a CT scan (although I cannot for the life of me figure out if they were there already or not, and none of them seem to be growing. The biggest ones that have been there since the mono FOR SURE have not grown whatsoever). None of them have gone beyond their original size and I would say the biggest one on my body has been 1.5 cm or thereabouts, with the majority of them being MUCH MUCH smaller.

This was a concern for me and I had been to many doctors who had kind of blown it off when in May, I experienced three full days of tingling and numbness in my face and behind my right eye. Ever since, I've had many many floaters, tingling in my hands and feet, my arms and feet fall asleep extremely easily, I cannot maintain an erection (very rarely in my sleep will I get one that's about 3/4 capacity which I can also get if I truly attempt to masturbate, although cannot maintain it. Sorry if that's TMI), and I am having the worst anxiety of my life along with all of these unexplained swollen lymph nodes. The sexual dysfunction has progressed. While I was quite sexually active before, I've found myself coming up with excuses not to have sex. As you can imagine, for someone who already has health anxiety, I am having a very difficult time dealing with this situation. I've also had a very dull ache under my right rib for quite some time now, almost like a fullness, but nothing except the lymph nodes has been revealed.

I do have polycythemia which is idiopathic (high RBCs) although they're unsure if this is related. I've had so many CT scans, MRIs, ultrasounds... I'm so exhausted. For an 18 year old to have all of this going on, the doctors are confused, but are convinced that I'm overreacting. I just want answers to what is going on. This is truly ruining a life that I wish I could enjoy. The last year of my life has been so unenjoyable for me at times, I want to break down. Is there anyone out there who can offer some insight and direction medically as to what I should be doing?