You are welcome.
Yes, IBS can cause symptoms of Overactive Bladder.
If you are at all confused, you have every right to know exactly what they will do, and exactly what they are testing for. It is your body, they cannot with-hold any information from you.
I understand, you've had a bad experience, it's only natural that you feel nervous. I'm sure that they know what they are doing but bladder problems can be quite personal and private it's understandable that you feel like that. You'll be fine I'm sure, try not to worry too much.
Just explain to the nurse that you had a bad experience before, they are bound to understand your concerns and will be sympathetic.
And no problem, any time, thanks for your support too, it's good to have someone to talk to, who is going through the same thing!
I might have to have urodynamics testing, I'm very embarrassed about this so I'm very nervous about seeing the urologist also, but it's the only way I can get this sorted.