Blocked neck artery was one of my biggies (as my fiancee and my pal Aruro can certainly attest). I think I actually made a post on it here recently... Anyways. I was dwelling on this for months- I wouldn't sleep at night (ever), I couldn't pay attention in class because I was too busy feeling my neck pulse, and so on. I basically lived in fear of it dislodging at any moment. I saw probably around four doctors about the problem, who all just felt my pulse and sent me on my way. I SWORE that I could feel a big, pulsating lump there.
I then had the fortune of seeing one of the most patient and kind doctors I have ever met. Basically, I had a breakdown in his office due to the stress and lack of sleep and begged for an ultrasound. Right away he could see I was a nut.
But he was very sweet. He talked me through it, explained that neck clots were pretty much impossible, listened to my neck just to put me at ease... and I FINALLY could accept it. Admittedly, I did email Aruro (another member on here that's a physiotherapist) asking if it was normal to feel a ropey, pulsating lump bit. I've basically learned not to poke around your neck too much.
SO I'm not sure if that helps at all. If you don't smoke and have your cholesterol at pretty good levels, there's no reason your neck would be clogged. (If you don't know your cholesterol, it's just a good idea to have it checked once every 4-5 years to keep track). I do NOT think it's neck cancer. If it was, you would be sick as a dog, your bloodwork would probably be off, and the pain would not come and go- it would progress.
Necks are basically a cylinder of muscle. Besides our spine and some veins, there's really not much going on in there. And my right side of my neck (just over my pulse!) is really hurting right now too... probably because I just wrote all this bit about neck clots.
So it just goes to prove that we are very suggestible creatures.