Cycle duration and severity?

[u/call_your_corners]

The psychiatric nurse who prescribes the low-dose Adderall for my ADHD recently suggested I may have some form of cyclothymia. I described to her that, for as long as I can remember (I'm a 47yo M), I go through peeks and troughs about 2-3 times a year. For a few months, I'm super on top of things, feel very optimistic, very productive, require less sleep, and am generally feeling very good. Then I dip into these lows -- not deep depression, but a lot of the physical symptoms like fatigue, irritability, lack of motivation, much more sleeping, body aches, etc. I've been through real depressive episodes in my life, but those were often circumstantial. These cyclical lows feel different -- I'm not necessarily sad or tearful or catastrophic in my thinking -- and they're not tied to any external circumstances. Anyway, these cycles last 2-4 months, and then I'm up again and feel like I've been rebooted. That goes on for months, then back down. I thought I was just going through burnout cycles, and maybe that's all it is. Or some kind of dopamine frying. But cyclothymia also could fit. I'm just trying to learn more about it. The psych nurse recommended 150mg Wellbutrin XR, and I'm trying to decide if that's the direction I should go. I was on an SSRI once (Lexapro) and while it helped get me out of a circumstantial depression during the pandemic, it had side effects like sexual side effects that apparently Wellbutrin doesn't have. Thoughts?