Lots of sex making it hard to orgasm

I'm a 45 year old female, married for 25 years. For many years our sex life was not good, only having sex like once a month. I've always been able to easily orgasm with my husband with clit stimulation through his fingers, my fingers, oral, etc..sometimes multiple orgasms. Recently I worked through issues that were holding me back from sex and we've been having a lot of sex, like everyday for the past 3 weeks. Suddenly I'm finding it really hard to orgasm. It's like my clit has lost sensitivity. Every time we have sex it gets harder, to the point I need a vibrator to get there. Last night the vibrator got me there but it was really weak. I'm aroused, I want to have sex, he excites me, and he always makes sure it's good for me. Is this just a case of needing to take a break to get some sensitivity back, or is this just my life now? Anyone have something similar happen?