Hi I had it done ,I found it very painful although some find it ok some find it bearable some find it unbearable ,I'm sure you can request a GA but it might take a while to get an appointment .

I had a hysteroscopy in January and it was nothing like a smear or vaginal ultrasound. For some women it is like period pains but for others the pain is severe. The trouble is you don’t know how you will tolerate it until you are having the procedure. I have had previous biopsies and I did tolerate them. Unfortunately I passed out and stopped breathing during my hysteroscopy. They had to then arrange this under a GA which I had yesterday morning. They do offer pain relief like gas & air, local anaesthetic but most hospitals will offer sedation or GA. Speak to your consultant about the option for GA