I was on Lithium too for 8 months.

Not sure if that's it, though.
I don't know exactly. I was only diagnosed two years ago.
I remember when I was younger I used to say that I was effected by this "magical energy." The energy would effect my mood. I always described it as "high tide" and "low tide." When it was high, I had tons of energy, was very fun and exciting, but I do remember I could get more irritable, but not anything like now. "Low tide" was when I was depressed.
When I was 26 I lost my oldest son in the divorce, because I also lost my home, and didn't see him for a whole year. He was only 3. I went from a full time at home mom to having no child at all. It was extremely traumatic. It felt like he was kidnapped or had died. Anyway, I often wonder if that might have caused the change because even though we have be somewhat reunited I don't think either of us ever fully recovered from it.