i experienced this as well, while i was pushing myself to the limit on chins up. I suggest you only do light workouts for a while. Mine was gone after a few weeks.

try to go for 'proper' massage.. it cud be due to ur nerves on the back of ur neck were too 'tight'( according to the masseuse).... i had encountered the same problem last time ... what i did was i went for massage n started doing stretching before exercise( i did the traps stretching), n everything went well... or just take a week off to stabilize ur nervous system... basically u need to try an error which one will overcome ur problem.... i dun think theres an exact answer for any questions about bodybuilding coz our body is diff.... its all about trying an error which one works best for u...

I sometimes too get a headache. A few times get a migraine. And I realize this is because I'm using my neck muscle when lifting (i know sound weird but hope u get the point). There's a time when I start to lift, I suddenly get a migraine and my neck hurt for about two weeks. What you can do is, try go to old traditional massage or try cupping.

Oh ya.When I said that I had a migraine, the guy eho do the cupping check my body.He said the headache is because I lift something heavy but not in the correct form. After the cupping, body feel so light and no more problem when lifting.But I still do cupping once in every 3 month.