I overcame post-text anxiety by simply going on to the next thing. It's natural to worry about it until you get it back, but you can distract yourself with other things to get your mind off it.
Also, I'm getting tons of mail from colleges. It's kind of making me nervous that college is looming so close ahead in my life, but at the same time I'm pretty excited about colleges seeking me out this early.
College is an awesome experience. You're probably at the hardest part right now.
Look for three things in a college: Climate, People, and Degrees they offer. (But not necessarily in that order). Climate because you want to be comfortable and feel 'at home'. People because you may not want to have non-stop parties going on in the dorm when you need to be studying. And Degrees because if a college doesn't offer what you want, to the level you want it, you may not be satisfied with what you can achieve there.
I recommend taking Philosophy and English Composition your first semester. Philosophy will help you figure out things in your own life to some degree or another, and English Composition will help prepare you for all of the essays that college expects of you. High School English rarely brings students to the level they need to be successful in college, so even having an idea of where you need to be is worth it.
And don't be afraid to take some 'fun' classes. If there's something that catches your interest, you can afford it and you have the time, go for it. There are several things you can learn from classes that don't fit into your degree plan, but would improve your life and expand your mind.
I really like college. I suppose that's my happy thought.