I have the same- very long thick wavy curly beautiful hair. It is one of my favorite things about myself.
I took Biotin and hit my Protein requirements thinking that would save me but anytime there is a large weight loss you are going to go through hair loss.
I lost heavily from 3 months post op to about 6 months.
The good news is my hair is still thick and you would never notice there was a shortage or that I lost so much of it- i am the only person who can tell it is thinner and i actually think it is more manageable.
The bad news is from month 3-6 the hairs come out like crazy. I felt like i was pulling pounds out in the shower when i would wash my hair - scary amounts I would lose on the daily. I thought i would be bald in a week if it kept up. Everything I wore was covered in hair- jackets- chairs i sat in- my car. You don't think it's a problem until it's a problem! It was so crazy i contemplated cutting to a short cut for it to be less noticeable all over me but I hung in there. I am now almost 6 1/2 months post op, 70 lbs down and my hair loss has returned to normal. I am glad I didn't cut it off and I love it just as much as i did pre op.
I was also very worried so I hope this gives you some insight.
Hang in there!