Are you serious? Mental barrier?
Anyway, it's probably tendonitis. I know the pain you are describing. Two years ago, I remember the first time I felt it, the pain was almost unbearable and didnt go away for a few days. I just took a couple weeks off from heavy pressing and got back into it slow. Nowadays, I can usually feel the pain setting in and can tell when I need to back off the pressing.
Most often this is what I hear people doing to deal with this, as well as ice and ibuprofen.