I haven’t read any of the responses so pardon me if this post is redundant. I just wanted to briefly share my experience. I too was diagnosed at 15 years old due to a manic episode with psychosis (my first episode had been depression). I struggled tremendously and nearly consistently for about 4 or 5 years and then made a full recovery. I became so much better that I was convinced that I was not really bipolar and my symptoms were a combination of hormones, life situation, and exaggeration. That is until almost 8 years later when I had the most severe and longest psychotic manic episode of my life. In the past 7 years, my symptoms have been very episodic which is typical and I no longer (and I doubt will ever) question my diagnosis. What you are describing does very much sound like bipolar disorder.