First off, I'm sorry that you have to go throught all of this. However, they are catching it early, and will be able to treat it asap! Now when you say colposcopy with biopsy, i'm assuming that you don't mean a cone biopsy (agressive treatment). So I'm going to go though your post and try to answer your questions for you:
I'm on the pill so I'm unsure about the ring, maybe someone else can help with that part? My Doctor said no sex, bath, swimming, tampons, etc for 24 hours afterwards. If I had to guess, I'd say that you wouldn't be able to put in back in till a day later, but again I'm not sure?
What day of the week is the proceedure? You may be able to go on your trip after all, but check with your Doctor. This proceedure is non agressive, it's to determine why you had an abnormal pap and what treatment is necessary. A treatment (leep, cone, laser, etc) is when you can't have sex, bath, swimming, and tampons for at least 4 weeks (depending on your Doctor).
As for my experience, when I had this done I took 2 advil before and relaxed afterwards. They just take a small sample to biopsy. It felt like a pinch when they took it, and the whole experience lasted no longer than a pap. It caused slight bleeding that lasted for a few days afterwards though. Nothing a pantyliner coulnd't take care of. Some people get cramps, but I didn't.
All of this is very hard to deal with, and it sounds like your trying your best to deal. It's difficult when you don't know what exactally is happening. After this proceedure you will know. I had my down days where I complained about it disrupting my life, but you will get through it. Once you are cured it's such a great feeling. I hope I was of some help to you. Post any more questions that you have. Goodluck