"I really dont think it's mono"
I'd agree with you if we adjust it this way: it's not *typical* mono.
If you have an overactive immune system, then you'll usually be "atypical". Such as having a swollen node that doesn't go down as it usually does for other people.
I've also noticed that a lot of people with overactive immune systems are predisposed to experience a lot of anxiety.
"itching to the legs"
That's important, because it points to an immune system problem - probably involving histamine.
Do you ever get skin flushing?
Do you have severe allergies?
Do you have a family history of immune system conditions like lupus, Sjogren's, Raynaud's, rheumatoid arthritis?
Did you ever try antihistamines like Benadryl to take away the itching, either tablets or creme?
Hi, there is such a thing as recurrent mono. It's rare, but possible. Had you been through a period of great stress or over-exercise or anything that could have weakened your immune system?
Otherwise, there are viruses such as CMV that can mimic mono symptoms.
Lymphoma? That doesn't fit well at all. We can go into that more if you like. What stands out, besides the things you already know, is that lymphoma wouldn't spring up so fast and then go (mostly) away just like that. I don't know why the doc would order the ultrasounds in your case. It's 99% sure that they will say "reactive", etc. Let me know when that happens :) You can even ask the tech while they do the scan, but most won't answer anymore because they are forbidden. You can post the ultrasound report here if you like. All in all, I wouldn't worry a bit in the meantime. Look at the US as a chance to rule out lymphoma - which we know you don't have anyway.
Btw, do you have a cat?
"there's still one there that is tender movable and feels rubbery. It's been there for a little under 2 weeks now"
It might still go down. Otherwise, during the immune battle, nodes can accumulate fibrosis (akin to scar tissue) inside and that can stay for years.