WOAH, are you me or what?
I pretty much wrote exactly what you wrote in a different thread! In fact, I had to double-check and make sure this wasn't the thread I started! :7
Yes, yes, yes. I'm having the same problem, and weirdly enough, it's in my right arm, too. I'm left-handed...not sure if that means anything. You aren't...left-handed are you?! ;-)
I tried with lighter weight but like with heavier weight, my arm cramped up and felt swollen to the point of where I either feel the need to put my arms farther away from my head (farther down the shaft towards the plates), or when it gets really bad, I have to put my arm straight down momentarily (which obviously ain't the safest thing to do with a barbell on yer shoulders! x( ) It's totally irritating and makes for a bad leg workout! I mean, all I can concentrate on is my painful, swelling arm!
Anyway, the advice I got was :
1) Try squeezing your lats together
2) Try putting a towel on your shoulders, or else get a pad for the shaft
3) Make sure you're not pulling down on the shaft
4) Try holding the barbell in front (under the chin)
I've tried 1-3 and none of them worked for me. Next time I have leg day, I'm going to try #4, but I'm not sure I'll be able to maintain the weight up like that. I've always had to switch back to my dumbbells, but they're a lighter weight than I'd like to squat/lunge.
I'm sorry you have this problem, but man, can I say that I am happy I'm not the only one! }(
If you find out anything, please tell me!!