25F (FYI - father has lipoma lumps everywhere and I have other raised lymph nodes that have been raised for years and checked)

I have had a lump in my supraclavicular node on the right side of my neck for a couple of years now, it is hard and doesn’t move but also you can’t really see it or feel it properly unless I tense my shoulders then it is very prominent. It is about the size of half a golf ball, maybe bigger, aches sometimes when touching. I can’t take a picture because it doesn’t show only the area is maybe slightly more swollen than the other side. No other symptoms apart from lymph node pain the day after a night of drinking but I have had this for years. I had a blood test my Dr said to have to show any markers for lymphomas and it came back with low serum ferritin (17) with normal range of 30-250, haemoglobin was 132 normal range is 115-165 apparently. Lymphocytes 1.1 and neutrophil count 4.7. After researching apparently blood tests don’t show lymphomas but anaemia is a sign of it. Please does anyone have any idea what I should do? It isn’t growing or anything but I’m worrying.

Thank you