Labia / vulva becomes very painful during arousal

[Garfield2021]

I have the ability to become sexually aroused, and reach the point before climax, but when i am almost there my vulva area has intense discomfort. It feels like a painful numbness, and is immediately too uncomfortable to touch, therefore i have never reached orgasm as the arousal stops very quickly after this. It's very annoying as i have the desire and arousal just not the final end point, it always painfully trails off.
I have read a few articles about internal pain, but mine is definitely the external parts of the vagina.
I have never given birth, and am under 25. I am on a combined birth control pill. I am suspicious that it could be hormone levels, or the rush of blood being what is painful, but i am unsure. Has anyone got any similar experiences, or an idea of what is wrong, and ways to help this issue out?

[AnnieBrooke]

Does this happen only with penetration, or any time you get aroused?

[Garfield2021]

This only happens when i get to a certain level of arousal that i don't achieve from penetration, so i couldn't be sure if it would happen then. This currently occurs from external stimulation, but i have experimented with techniques, and i am sure it isn't the pressure i am applying that causes the problem but the arousal itself.

[AnnieBrooke]

Hm. I do think I wrote back to you, but even hitting a character and posting it is not bringing it back. What I said is that this could be vulvodynia, and could be clitoral phymosis, but I don't know if you would be able to get that definite of a diagnosis from just an average ob/gyn. In your shoes, though, I'd definitely start with your doctor and see what he or she says.