Hello, I would be happy to help you with your question.
From what you are saying, you are 41 years old with 4-5 years of painful cycles and, overall, a relatively normal sized uterus
. I am not sure why they are calling it "bulky" but sometimes this occurs with fibroids or a condition called adenomyosis
. A consultation with an OB/GYN would be a great idea in terms of sorting out exactly what is going on and what your options are for better treatment.
I hope that this helps and good luck!