I already edged. Should I let it go?

Your body will absorb or release excess sperm on it's own. The only way to "clog" ready to use sperm would be to constantly edge and not allow everything to stay in place or go back the where it needs to be. You can ejaculate but it's no cure and of course it'll set you back. If this is something you're worried about then don't, if you're suffering discomfort or pain then go for a dip in some cold water or reach for an ice pack. Blue balls symptoms go away on their own if you don't contribute to making them worse via edging.
As for health issues there still exists no concrete evidence to connect nofap to them. There are too many factors to consider in most these studies such as age, diet, participant's current condition, and sample size to name a few. From most what I've read I've yet to come across a reputable source to say abstaining from ejaculation can be harmful to you.
But remember i'm just some guy on the internet. Do some research yourself, and consult your doctor about it.