Thickened womb lining and D and C

Hi I have just been told my womb lining is thicker than it should be at 14mm I was also told it is an irregular shape and has, what look like, bubbles within it?! I have now been booked in for a D and C. Is there anyone out there that has had a same diagnosis or similar? I’m very nervous about the surgery and having a general anaesthetic and would like to hear from anyone whose experienced it. Thanks 😊