lymphnodes?

Hello,
I have lymphnodes swollen under my chin, my right armpit, and neck on both sides.
There are hard lymphnodes under/behind both my ears at the top of my jaw. They feel like small pebbles.
These lymphnodes have been present for about a month/1.5 months.
Been feeling fatigued, but other than that I cant find any cuts/bruises, I dont have a cold or anything.
Any advice? Should I call my GP, or is it nothing to worry about.
Apologies If I hav posted this in the wrong forum/section :)
Thanks, philip.