Lymphoma

Hi. Hoping someone is here to help or offer advice. 

I have 2 lumps on my neck, the left side. One is ever so slightly above the collarbone and the other is on top of it. They’re firm. One is about the size of a 5 pence coin and the other is about the size of a 20 pence coin. I discovered them accidentally, never thought anything of it. But I have been suffering with really bad itchy skin, especially my legs at night, along with fever like symptoms that come in waves and night sweats. Fatigue has been the bane of my life, I can barely function. As well as pain in my left armpit and left breast - which has got the most horrid ache 24/7 and changed in size massively. I spoke to a close friend who was diagnosed with lymphoma years ago, and she urged me to get check. I saw the GP and they couldn’t find my lumps, despite me pointing them out. They insisted it would be nothing, and just ignore it. I asked and insisted for an ultrasound. Had the scan, and they didn’t even scan over where I explained the lump was. Been told “normal, no action” and I feel like I’m going crazy, like talking to a brick wall. My gut is telling me something is wrong. 

Do I just ignore these symptoms like suggested? Or do I try stand my ground and insist my symptoms are looked into and explain Id like an answer as to why I have the lumps.