Can I still have lymphoma with normal blood tests?

Hey I have a question and wondering if anyone would be able to offer advice. I have been suffering from fatigue for several months now. Been clawing at my chest and legs as they feel so itchy - when I do i5ch my legs they are bruising easily and quite significantly. I have also had a swollen lymph node on the side on my neck that I have had for several months but I wasn't concerned about it as it was not sore. I went to the gp and they took some bloods which came back normal. I have been referred for a chest xray and hematology - it's been 3 weeks and I'm still waiting to hear. My gp wasn't concerned it could be lymphoma as my blood results were normal but from what iv read online the only way to test for lymphoma is a biopsy. 

Can lymphoma still be a possibility or I'm worried wasting their time?

Many thanks