I think it's good advice to take someone along if you can.
Maybe a notepad & pen to write down any info so you can refer to it later.
And make a list of any specific questions you might have right now.
Here are some issues with cystoscopy:
A complication unique to cystoscopy is the risk of perforation or a tear. A perforation can occur anywhere along the urinary tract-the urethra, bladder, or ureter. The risk of perforation increases with the complexity of the procedure being performed. Most perforations can be managed conservatively, without open surgery. A small flexible tube called a stent can be placed in the ureter to bridge a perforation of the ureter and to allow urine to drain into the bladder. Similarly, a Foley catheter (a flexible rubberized tube) can be placed into the bladder to divert urine from the bladder and urethra while a perforation heals.
Cystoscopic procedures can also create scar tissue. This tissue can cause a stricture, or narrowing, in the urethra, which may cause difficulties during urination. Sometimes an additional cystoscopic procedure is necessary to remove the scar tissue. This complication is almost exclusive to males and most commonly results from urethral manipulation such as resection of the prostate.
For a variety of reasons, urinary retention (inability to urinate) can occur after cystoscopy. This will generally require the placement of a catheter to drain the bladder.
Swelling caused by the procedure can obstruct the flow of urine.
The bladder can also become distended during the procedure, which temporarily weakens the voiding muscles.
Anesthesia plays a significant role in the development of urinary retention as well. Even people who have surgery in areas of the body away from the urinary tract can have difficulty urinating after surgery.
This info is from: http://www.emedicinehealth.com/cystoscopy/page2_em.htm
Good luck tomorrow. Hopefully it's some swelling from the scope or a slight perforation which heals quickly!