Anyone need to be sedated or go under fully for a root canal?

Had X-ray done and un fortunately I need my first root canal. It's on the back too, and it made me nervous because I have not only TMJ jaw pain often, I can't open my mouth fully, and I also have a misaligned jaw . If pain is near the joint area of my jaw, I get vertigo, from the misaligned jaw.

I explained this to the dentist and he said with these three issues it would be hest for me to go to a place that does sedation or even under anesthesia. I had a feeling that could be an option, but I'm nervous all over again. I have never been sedated for any dental procedures. Not sure if it's just better to go under anesthesia instead?