Worried about Lymphoma.

Hi all, about 2 months back I noticed a groin lump, at the time the drs said it may be a cyst. Gave me some antibiotics and it still persevered. It’s doubled in size but more long not wide, so it’s gone further up my pelvic bone area. Prior to this I had night sweats, ridiculous itching all over, minor weight loss and just horrible fatigue. I have been back and fourth the drs and have had to ask if they could send me for an urgent ultrasound (tomorrow) to get the lump checked.
as of two weeks ago I’ve had horrible collarbone pain and neck pain, and two distinct lymph nodes in my neck that are swollen, however I went to a&e before for the pain in my neck. And the dr essentially just said ‘lymph node swelling can be normal, it won’t be Lymphoma as your last bloods were fine’ they did not repeat my bloods; he had a little feel of my neck and confirmed they were lymph nodes but essentially just sent me on my way. 

I feel so defeated because I am having many signs and symptoms of lymphoma and it is causing extreme anxiety, I also feel dismissed and just sad at the moment. 

thanks for reading!