My husband has a few dozen enlarged lymph nodes all over his body. They look weird, like big lumps under the skin on his arms, his legs and his torso. The doctor keeps an eye on them, but says as long as he can move them easily they are not a problem. There is a name for what he has, but I forget what it is.
That's not to say all enlarged lymph nodes are not a problem; they can be a symptom of lymphoma. I hope you can get a solid answer about yours, hopefully one which will relieve you of your worrying.
Also, if that doctor you were seeing was unable to give you a solid answer, I wouldn't worry about that. I'd rather have a doctor say, "I don't know. That's not my area," than give me an uneducated, possibly incorrect answer.
Karen