If you're playing it to its full seriousness, I'd strongly discourage having an OCD character in the first place. IIS has a pretty wacky cast so far. We may go into some darker territory, especially regarding Carlos--I'll foreshadow that now--and his animosity towards Pokemon Training, but having a mentally-disordered person on medication who attempted suicide in the past... just that description on its own is tipping a bit over the edge into Mature territory that I'd be uncomfortable getting into. I wouldn't want your character to seem out-of-place. There would have to be a lighthearted or humorous aspect to it to keep it from being too grim.
But the specific detail on "attempted suicide" seems like a detail you can dance around if it's just mentioned in the history.