Can a cyst in eyebrow cause swollen and tender lymph nodes in the neck - same side as the eye? I'm also extremely fatigued x3 days.

Well, if the ... ...cyst is actually an infectious process, such as an abscess, etc, than maybe that would cause some lymphadenopathy. Get an eval with some possible labs including a cbc-diff to diagnose your condition if it persists. Good luck.