There Is A Reason It Hit The Bedroom First
Your SSRI floods serotonin. That raised your floor and stopped the crashes. It is still doing that job.
But that flood also presses down on what sits underneath: the nitric oxide signalling behind an erection, and the dopamine behind drive and reward. One flood, two effects.
The bedroom is just the room that reports back fastest. Losing interest in your hobbies takes years to notice. This you clock the same night.
Same ceiling. It just showed up where you could not ignore it.