This is some a advice I gave to someone else a few weeks ago that was having elbow problems when doing triceps. Your problem might not be a triceps issue, but its an elbow issue....thought this might help.
"whether you know it or not, most likely you do have an elbow ingury. If you have been training for few yrs, you probably developed it over time from doing bench presses, skull crushers, tricep pull downs, etc... you have got to keep away from locking when doing these excersises. Like i said, most likely this is what has caused your ingury. Any professional body builder will tell you the same thing, to keep away from locking. its very bad and hard on your elbows. Your elbows are made up of joint, ligaments, tendons, and bone. those ligaments and joints are extremly fragile and brittle and if mistreated, can be ingured easily. Id suggest hitting up a heating pad during the evenings and getting some glucosomine. Id just take it easy. when it comes to tricep training, do mostly pulldowns. stay away from overhead dumbbell extentions, dips, etc...as these put lots of stress on your elblows. Also, you can wrap them, and that will help with the pain. good luck bro, just dont push it to much until you are fully capable of doing so."
[/SIZE]EAT, SLEEP, LIFT...REPEAT