I can feel your tension in your writing, and I can see you're scared. I know and understand fully, but try to relax a little bit. My Wife went through a very bad spat of Mono. She tested positive for EBV in August of 2005. It's just now fully out of her system. She had horrible fatigue, swollen nodes, stiffness... all what you're talking about. I would relax and rest up as much as possible. Get and stay on a healthy diet, and take lots of vitamin C to help your immune system. I would wait on any other testing until the Mono is gone. Fatigue is such a common symptom and swollen nodes can be impossible to diagnose. You also don't want to put yourself through the stress of waiting for results, or paying for the co-pay.
I wish you the best, and hope you get better soon!!!!!