Unlike these blokes, I was actually in your position. I took Calc II in high school, aced the BC AP test, and never bothered with math again. Then I sort of ran off into drugs and alcohol for nine years or so, and only recently came back to it. I *just* finished taking Calc 1 as a refresher course.
Do you need trig?
Yes and no. Yes, you really need to re-learn it, but, no, you don't need to take a class on it. Remember, trig was just a unit in Geometry, and you learned more about it in Algebra 2 and Calc 1. But it was never its own class.
The identities are helpful, but unnecessary. Just remember the good ol' Pythagorean Theorem. That's the basis of all identities, anyway. But you should learn them, regardless.
Just remember, you don't *need* to re-take trig, but you *will* need to re-learn it some way, usually online. So be ready.