Good Afternoon,
I have actually been to see quite a few psychologists, psychiatrists and regular GP's for my "emotional issues." All of them seem to have different views of what's going. Some say it's just depression and anxiety and yet others say there's also a bit of ADD going on. I'm not currently in any sort of therapy program as it never really worked for me. I did have a weekly therapist that I saw for about ten years, but couldn't keep wasting money on something that wasn't working, so I stopped that.
As for what was going on when I was 15, there really wasn't anything. I always thought it was teenage angst, but it's followed me ever since. My mother always says it's in my head. Maybe she's right