This is all pure speculation on my part, but please hear me through. I've observed some strange mood patterns over the past several years, and they're getting more pronounced.
Here is an outline of everything that seems relevant:
Age:
11: I nearly killed myself (in a manner I will not discuss here), because I was upset over math homework. I was shaking I had come so close to doing it, but I stopped myself. Never told anyone.
12-15: Fell into a a rapid suicidal spiral of depression within the first few months of middle school. I never really recovered, but came out of the depression. This trauma effectively deadened all emotions beyond a superficial level, leading to an intensely introverted and schizoid lifestyle. Mood was always roughly neutral with very shallow emotions. I wasn't really alive so to speak.
16: I realized just how empty I was; upon realizing this, I immediately became suicidal in the blink of an eye. Lacked the will to do it, and the depression set in after I couldn't do it. I stopped going to school for about 18 months, during which time I was the most depressed I'd ever been.
17: Became "neutral" again, after the depression subsided. This is where some of the symptoms start becoming more pronounced. The major episode was gone, but I started having days where I get an intense urge to kill myself, and or intense depression. It never lasted more than a week, but it was often just a day or a few hours that my mood would shift so suddenly. I could remain neutral for weeks in between these occurrences.
18: This is where I'm at now. I'm still getting occasional hiccups, mainly just rapid rotation from depressed to neutral, and sometimes minor happiness or contentment.
Yesterday (and the reason for creating this topic), I experienced something completely different. I believe it was a minor episode of hypomania. It started right when I went to bed last night. I felt an intense pleasure described only by a state of pure euphoria. I began conversing with myself incessantly for the next 6 hours in bed. During this time, I felt disinhibited, creative, productive, and like I could run a marathon. I slept for two hours, woke up, and started cleaning the house, vacuuming, and started sprinting on my long neglected treadmill for the first time in almost a year. I accomplished more in a few hours than I normally do in a week (due to lethargy and apathy most of the time).
Whatever this was, it was great feeling I've never experienced before. A literal high of sorts. It was, however, short lived as it gradually tapered off after the treadmill.
None of this to me suggests anything clinically significant, but it does leave me scratching my head. As stated before, I've developed along a path that limits emotionality, but it seems to be coming back to me slowly for the first time ever. I'm beginning to feel alive again as I get older and more mature.
My question for the people that have insight into mood disorders, especially as it pertains to bipolar/manic depression are:
Is there anything to be concerned about? Are the things I've noticed just anomalies, ie is there no reason to believe this is going to be a recurring pattern or could intensify?
The relative intensity is hard to judge because I've learned at a young age to tolerate and function to some extent with the very worst my mind has subjected itself to. I can hide my mood exceptionally well, even when I've planned to off myself, or for example last night when I was high. I tried to see if I could remain calm and collected, and I could, but simply didn't want to. It just felt so right to keep blabbing. I bring this up because it seems to be in complete contradiction to anyone remotely bipolar. Is this in itself enough to exclude the possibility, or could it be from a combination of personality and life experiences that enable me to hide my mood so well?
Sorry for the long post. 2 hours of sleep in past 50 hours makes it hard to be more concise.