Cure for extreme pain when getting hair done aka Tenderheadedness?

I’m 26 and my parents always thought I was being dramatic when I was younger and would scream at my hair being done!

It makes me cry and the pain is excruciating, it’s so embarrassing sitting in the salon chair and crying my eyes out for hours because of the pain.

Last time I took some over the counter paracetamol and Codine, before and during, yet it was still SO painful.

This time I’m going to personally buy a relaxer for coarse hair, hoping that makes my hair less knotty.

It’s a combination of my hair naturally being SO knotty and my scalp being SO sensitive.

My hairdresser takes 7 hours to relax, blow dry, cainrow and install my sew in. I feel so bad!

Anybody have any idea what I can do?

I’ve chopped my hair off 3 times and just worn wigs but I’ve grown it to such a beautiful length and don’t want to give up again.