I held my pee for 2 hours yesterday. can this cause irreversible damage?

If you continuously hold your urine for extended periods of time, you can stretch out your urinary bladder and cause it to work less effectively. Urine held for long periods of time can also reflux back into the kidneys which can cause problems. But, doing it one time is very unlikely to cause any issues. But, try not to make a habit of this. Good luck to you!

No. Fortunately this is one control we have. But not a good idea to do it too often