Bipolar is cyclical. It's got better and worse, and will ebb and flow. That's also an age where, for some, growing up becomes the hardest thing you want most to do but feel least equipped until you do in fact grow up. Maybe that's how I felt about it, and nobody else. Dunno.
If he doesn't want your input on meds or anything then that's unfortunately his choice. I hope that everyone can see their ways to calmer days.