I need advice ladies, and I'm new to the forum!! (Forgive me long winded)
I have very fine hair, but very course. So most stylists see it and think put a super in my hair, but because my hair is fine I try to never to use super because it often breaks when using super.

Now for years, I've been going to a great hair stylist. She has been great with styles, and uses good products. However, when I was in college I used a very mild relaxer. I used Precise mild and I had pretty good success in getting the length I wanted. She used Affirm, and I never got the length I wanted, and it burn pretty bad.

I can't use Dudley, Affirm, Motions, or anything regular.
Now, she switched to Design Essential Sensitive Scalp about 2 years ago, and I loved it. Less hair in my brush, ABSOLUTELY NO breakage, I maintained the elasticity and my hair [was] super thick. She ever was telling me who many came into the salon asking why my hair was so long and beautiful. I've always been health conscience, so that's the only reason.
HOWEVER (here comes the crushing blow), he ran out of that one day, so she used Affirm regular. It burned, but I never saw anything drastic, until I got home. The next few days, my hair was SUPER dry, and then I started to see breakage a week later. Some 3" pieces, and some pieces near the root (8"-10"). I was devastated. I thought it would end, but never did.
Now I'm back to the Design Essentials, but the breakage will not stop. Even Aphogee did not stop the breakage. My hair is getting thinner and thinner. I had about 2 years of beautiful hair growth, all for it to go down the tubes in 2 months.
What should I do? I don't want to offend her, because she's the one who introduced me to DE, but her mistake has cost me. Secondly, I was growing my hair, because I was considering getting married, and I wanted to avoid a weave (I've never had one).
Anyway, have anyone of you had this happen. I'm willing to trim off about 4", yes, 4" to have short hair so that I can have healthy hair. I know stylists can be sensitive, if you try to tell them how to do their job. It's my fault for not telling her about my breakage before, but I though it was temporary. I just believe that with Affirm my hair never grew (reason I went natural for 5 years), so why take a chance with it again. I guess she thought one application won't hurt, but she didn't tell me she used it for one application. I just happened to see it when she put the bucket back on the shelf.
Tell her, and demand DE and ask for a trim? What do you think?