Lexi,
After reading your post, the main thing I took from it was that your SO sounds very controlling. I mean its one thing to not approve but another to check in on you by calling or even using Facetime just is going a little overboard but that's not here nor there. In all honestly, its tough trying to be who you truly are while trying to be a good SO to somebody that doesn't approve of that aspect of your life. If this trip helps you keep your sanity, try and be able to make it, otherwise its just going to be harder for you because you don't know when you'll get the chance to do it again. If you can't make the trip but your SO isn't going to be home, hopefully you'll be able to dress for a little bit there. That way, you should have to rush to try and remove the make-up or hide the clothing. What ever you decide to do, make the best of it.
Rachel_B