I had to have one....standard practice in Bristol. It's vile I have to say, they offered me sedation but I opted to have just the spray, had a bad experience previously with endoscopy & sedation , but I'm glad I was awake for it. To be honest they just check to see hernia, condition of insides etc & job done took about 5mins all in all but its not nice. The worst has to be the spray it tastes of fish! Then Bananas & that's 2 of my hates so made it worse for me & you just feel like you're choking because it actually numbs & the tongue feels like it's so swollen...horrid! Good luck if in doubt go for sedation that way you're none the wiser x