Relax. You should do fine. Drink plenty of fluids the night before and avoid Aspirin or other anti-coagulation medications. Check out spine-health. Com. Good luck.
Drink a lot of. Drink a lot of water to be hydrated and make sure you stopped any blood thinners a week to 10 days ahead or as directed by your physician.
CT myelogram. It depends it you will be awake during the procedure or if any anesthesia will be used. Usually, there is not any specific preparation that I can think of. I have had such a procedure performed on me, it was not a big deal. I had to lie on a table and local anesthesia or numbing medication was used. It was not painful. Try not to worry and good luck.