hard unmovable lymp nodes in neck - emergency referral

Hi everyone, 

I'm a worried 24 year old mother of 2 desperate for some advice 

Before Christmas I noticed a small hard lump in my neck, this has grown and grown and now can be seen under my skin, and another has appeared just below. I have been to the doctors who told me it was my lymph nodes and said because I've lost weight (nearly 2 stone) and having night sweats as well as the lymph nodes being hard and unmovable I needed an emergency referral to haematology  in 6 days time

has anyone been through similar - what was the outcome if you hard hard swollen unmovable lymph nodes?

what should I expect seeing the haematologist? 

i hate the fear of the unknown - cancer (particularly lymphoma) been mentioned and it does run in my family but obviously nothing can be said about what it really is, but the urgency is worrying although I know it's protocol.