greenandchic
Well I can tell you this. My hair is protein sensitive. I don't use protein on my hair at all and I had to find that out the hard way. My hair started doing just like yours only thing is when I found out my hair had already fell out and that is when I was mega tek and all other things everyone was using to grow their hair. but that also answered other questions for the years that my hair seem it was not growing when I knew that my hair by then would be longer.
So in 2008 I had to cut all my hair off and start all over again which leads me to this date. 3 yrs later I am almost bsl. I never use protein so if my hair does not get it from natural sources or the other products that i use on my hair it will not get it. The only thing I use on my hair is the henna which others have said can act like a protein.
Now I had a little experience with sulfur some months ago and I caught that early. I used a very moisturizing conditioner that someone here suggested on the foam that cost $30.00 and I went with moroccan oil intense hydrating mask. It worked wonders and I don't try anything new anymore and just let my hair grow as it grows.
So mines did and I had to cut it but you may be able to save some of it and cut away the back that is messed up and it is hidden under the length.