Just to add to this: An idea might be to put the vaseline in the freezer or fridge. The coolness might be an added help.

I would also suggest sitting in a bathtub, or holding a warm or cool cloth to your vulva a couple times a day. What every feels best.

Please remember about the vaseline though, that it is not safe to use with condoms. It will eat away at the material, so even if you are using the vaseline and have sex w/ condom several hours later I'd be concerned. But, it doesn't sound like you're about to have sex anytime soon.

Good luck