I Went On The Contraceptive Jag For A Few Months

I went on the contraceptive jag for a few months and it has taken away all pleasure during sex and I know this because I had sex with my boyfriend before I went on the jag and it felt great it was pleasure but then I went on the jag and after that I felt either pain or nothing it's just horrible to have sex now and I've been to the doctors about it she said it was a common side effect of the injection but I wasn't told this before the jag or I would never have gone on it and it wasn't in any leaflets they gave me either which I'm very annoyed about because it has ruined my sex life