Nooooooo, don’t panic, I have had two family members with serious problems have it done and they sailed through it. You will spend time on the loo but just keep calm, lie down and keep your mind occupied with other things. You will be telling us soon that everything went well and that it is all over. Just bear with the discomfort for a bit and understand that it won’t last long. Open your window to let fresh air in and just take deep breaths. Really and truly, I am not just trying to reassure you, it is NOT so bad. The two ladies in my family who had it came out smiling. Pleeeeeeeeeeeease don’t get in a knot over it. All the best.