Panda-K-Bear
I sympathise with you for being in that position!
It is certainly not pleasant I know! I have (as crew) had to pop out of our crew rest to the loo during seatbelt sign on. Like you, there was an urgent need
. I was lucky in that the crew rest was less than 1m from the toilet door, and it was in an area where there are no pax, so no one could see me. The rest of the crew weren't going to say anything!
The problem we have with passengers getting up is not the risk to themselves, but the risk to other passengers when you hit the real turbulence and go flying (as you know, I'm sure, that if you hit REAL severe turbulence (not what passengers generally call it) you will go flying) then you can injure other passengers quite easily.
Not a nice situation to be in!