Saddle, shorts or lube?

[KnottedYet]

Just realized part of my post probably didn't make sense.
Chronic vestibulitis and vulvodynia (and often even cystitis) have mechanical causes. Very often the cause is a coccygeal derangement, which makes all the tensions "off" in the pelvic floor.

(Imagine a group of people holding a parachute nice a taut, then one of them pulls extra hard on his bit and knocks everyone else off balance, distorts the parachute, and puts big wrinkles into it. That bad boy is the coccyx. Now the parachute doesn't work right. And it gets irritated.)

Vestibulitis plus diagnosed pelvic floor dysfunction is a big red flashing sign for a mechanical problem. LS is more an autoimmune issue, which can be kicked into high gear by the other two. But you want to rule out the standard autoimmune problems for that one first.

Your PT has pulled you from riding, thinking the saddle of the bike is contributing to the problem. Mechanical contribution time. Measure your sit bones.