I've gone through this scare. Lost my spleen many years back and now every time I get sick I also get swollen lymphnodes in my neck. First time it happened I totally freaked out.
Doctor told me several things:
- Movable is good
- If it's tender, that is good (lymphoma is not painful when you touch it)
- Think if you've been bitten by a bug, had a sinus infection or even allergies recently. All these things can cause swollen lymphnodes
- No other symptoms is good -- you generally have other symptoms with lymphona
There are tons of lymphnodes in your neck. They can be triggered by various things. One time when I was in college (before I had this kind of anxiety), I had a lymphnode swell up. Turned out a spider had bitten me on my cheek. On the surface it looked like a blemish, but all the irritation had drained in the lymphnode.