Accidentally told iphone not to trust computer, won't show up on itunes?

I have an iphone 5c and a windows 8 computer, and when i plugged my phone in to my pc i accidentally clicked "don't trust." now when i plug it in it makes that "device recognized" noise or whatever but the second i click "trust" it makes the "device removed" sound. It doesn't show up in itunes anymore and literally All of my music is on there. I have no idea how to fix it, and everyone is refusing to help me. Am i just really stupid, or?

Added (1). Samuel: i've done that at least 50 times now. That's part of the problem.

Just unplug it and plug it back in. It should work fine!