Maybe you'll listen to me...or maybe you'll go find someone who will give you the answer you want to hear. Either way, I'm going to try to be nice (which is hard) and help you out.
1. You need to PM KSUViolet06. She is a tri sigma alum, a national volunteer and can help you as a sister.
2. The long and short of the matter is, you need to put your education in front of your sisterhood. If that means transferring to a school without a chapter then it's what you have to do. If you need a group of women to belong to at your new school, live in an all-women's dorm, join a knitting group or volunteer for the girl scouts.
3. Sure-you can disaffiliate, but you still can't join another NPC sorority. Maybe your new school has a local sorority that will want you. It's your only choice to become an active sister at a school without Tri Sigma. And there's no guarantee that they'll take you either.
4. A lot of women find that going alum is very rewarding. You can get involved with your local AA and meet more sisters.
5. You've got what, 3 years left of college? If you love Tri Sigma as you claim to, you can still stay a sister and be involved even if you're not active anymore. There are hundreds of other clubs you can get involved with at college. I had just as much fun with my taekwondo club friends as I did with my sisters-more in some cases.
6. The NPC unanimous agreement is not bullshit or 'gay'. Please don't use the word gay to describe something you find stupid. It's offensive, especially to me because my big is actually gay and I love her with all my heart.
Have you considered the University of South California for media studies?
Also, what about Marist College in NY State? They have your major and a tri sigma chapter.