clitoral hood swelling

In the past three years, I have developed a very annoying problem that has greatly interferred with my sexual relationship with my boyfriend. When my clitoris is touched either orally, manually or with a vibrator, the clitoral hood becomes swollen and covers my clitoris to the point where I can't achieve orgasm. I need the direct contact and am no longer getting It. Would a female circumcision help? I think it would....but what is the cause of the swelling. I never had it before. I am 55 and have not had a period for 4 years.