Swollen lymph node

Hi everyone!

About 4.5 weeks ago 3 lymph nodes in my neck/chin were enlarged to around the size of a malteaser and I didn't think anything of it. Im only 18 and my mum is a nurse, we both thought I must have some kind of infection even though I never had any infection related symptoms. 2 of them have shrunk but 1 is larger and very hard, I can also feel another hard one in my neck. These areas are very itchy as well as my legs which I discovered is a symptom of lymphoma.

This would not have worried me however last year I had many infections and sepsis so many times and no lymph nodes were enlarged at any point then so it seems weird they would come up when I feel fine. 

I dont know what to do about it as Its so hard to get a GP appointment right now and I dont want to waste their time!