Help! Extremely aroused but struggling to reach the big O

Hi all, really need some insight into what's going on. Over the last few days I have been extremely aroused, to the point where it feels almost painful down below. Typically I can easily reach climax using clitoral masturbate or sex with my hubby. For some reason though over last few days I've been an awful lot more aroused than normal and I'm really struggling to climax, even with clitoral stimulation. Last night it took nearly 2 hours of sex with hubby for me to reach orgasm, by the end I was almost crying with frustration. The only thing that worked was penetration in a position we never normal use as it's typically painful more me. Tonight I thought I'd be kind to be my hubby and let him have some rest and masturbate instead, well that took nearly 30 mins and I had to resort to using the vibrator internally to climax, so not like me. Can normally reach orgasm in minutes masturbating. And even after masturbating I want more!!