If you had leukemia, you would know. People feel like utter crap when they have it. And not just anxiety crap, AWFUL. Plus if you've had a blood test any time recently, you are 99.9% clear from leukemia. Leukemia patients have off the charts blood work.
Lymphoma tends to have off blood work as well. I was and still am slightly worried about lymphoma too (despite being dismissed by several doctors and blood work) and they all told me that 1) they can tell cancerous/suspicious lymph nodes from normal nodes and 2) if you had lymphoma, SOMETHING would be off in your blood work. A lot of times, people with lymphoma have drenching night sweats. No, not a little sweating (which I freaked out about when I was worried because I started to sweat in the summer, so dumb when I look back on it). Having to change the sheets and clothes types of sweats. And even if you had that, there are many, MANY other things it could potentially be.
If you're having to dig for nodes, you're fine. When doctors look for nodes, I've noticed they softly apply pressure to the neck. If there was a lymph node big enough to warrant concern, they would be able to see it by doing that. Basically everyone has some sort of palpable node in their body (sometimes they are suspicious looking but totally benign). Lymphoma nodes don't cause you to look for them, you usually they literally come out from the side or front of the neck.