AFAIK the only character-affecting curse is the Black Breath. However, the TY_CURSE/Ancient Foul curse has a tendency to replicate to other equipment you're wearing, so if you're not careful you could end up getting a lot more equipment cursed.
EDIT: I suspect that you weren't careful enough when changing/disposing of your equipment and probably had a piece of cursed equipment left. You can easily test in town: Use a *Remove Curse* and drop ALL your equipment and then just move around town for a while without doing anything else. (You might still see Black Breath going off, but you should definitely not see any paralysis or anything like that.)
So after more testing, apparently the character sheet spot labeled Mrg. Curse isn't accurate. My symbiote of all things had the curse, and I'm 95% sure I didn't check that the first gear replacement session. Even worse, releasing it and recharming it gets rid of the curse, making it the only piece of equipment in the game that I know of which can be 'cured' and yet the only piece I didn't try.
The pile of loot I have left on the ground would have launched a thousand wars. Rings of power, cubragol's +10 speed and full esp, y'all know the rough list. It's enough to make you consider keeping the curse.