I think it's good you're talking about it.

Like Hoping I believe psychosis is when someone loses touch with reality, may hear and see things which are not really there. This doesn't sound what you are describing.

If you do tell your pdoc they will likely be very familiar with self-harm and it will better equip you both to devise a strategy to cope with these urges. I know some things can feel scary to discuss but they really will have heard this before.

If you feel you'll forget then maybe write it down and carry the paper in your hand, you can use it as a prompt or even hand the paper to them if you prefer.