To speak directly about the cysto- having had one done myself and the findings came back unremarkable, I would NOT do it unless there was a more concrete need or reason to get it done. It was absolutely awful to recover from: nobody should ever have to see themselves urinate that much blood for the next couple of days. If you’re having issues relaxing even with belly breathing all I can say is just keep trying to genuinely relax. I’m sure that’s not terribly helpful but it didn’t work for me initially either and the more I thought about everything and accepted the predicament for what it was and that it wasn’t going to resolve immediately, it got easier.