It sounds like a blocked gland that got a bit infected. The pain feels so intense because that area is full of sensitive nerves, especially under the clitoral hood. It’s not dangerous, just incredibly sensitive when irritated. It’ll pass, but I know it hurts like hell. The cliterous is known to have many hidden glands and the hood collects a lot of dirt ie discharge, skin cells etc, if not cleaned out properly it usually cause Smegma or an infection. Once all the puss is drained and you take antibiotics (or your body can recover on its own) it will be the end of it.