Yes - I also remember the feeling in the Great Pyramid at Giza. That was something else. You have to bend over and walk about 150 feet to the burial chamber. The passage is only about three feet wide and four feet tall.
I had claustrophobia badly there as well, but I just kept telling myself "these rocks have held together for 4000 years, they are not going to fall on me" and "I really want to say I walked into this pyramid as far as anyone can go."
But that was one of the tougher claustrophobia feelings. I felt a lot better when we finally got out.