Anxious despite having scheduled colonoscopy with Propofol

Hi

I've booked a private colonoscopy under Propofol (due to very long term procedural anxiety issues) - but as the date of this gets closer I am finding more and more things to convince myself to cancel. 

I've solved some things such as travelling after the second dose (so I've booked close by hotel) but I've found that neither my GP or the clinic will prescribe anything to calm my nerves (the day before or in the morning)

It seems that if you choose the conscious sedation (Midazolam/Fentanyl) then they can offer something to calm things down but choosing enhanced sedation with Propofol means they wont.

I have enquired with a US clinic and they agreed to Propofol AND pre-procedure anti-anxiety meds but here in the UK it doesn't seem that way.

I don't really want to spend a fortune and still have to torture myself to get there - anyone got any advice?

Thanks!