It sounds very much like your hair has been subjected to traumatic chemical damage, which will result in dry damaged fragile hair. There may well be Trichorrhexis nodosa, which is a break in the cuticle of the hair shaft, please see the image attached. This causes Trichoptilosis, (Split Ends), which is the longitudinal splitting of the hair shaft and Trichoclasis which is the transverse fracturing of the hair shaft.
To treat the hair, it is important to use an excellent conditioning treatment, cut off as much of the affected hair as possible and avoid any further trauma to the hair.
Nioxin Deep Repair Hair Mask would be a good conditioning treatment, or something similar that is rich in glycerine and protein such as wheat germ.
On longer hair and dark hair use extensions to create a balayage effect and avoid the chemical damage completely. I recommend Rapture Hair Extensions to my clients because they cause absolutely no damage to the hair. If you opt for extensions to create a balayage colour, do your homework, visit a reputable extensions specialist and discuss different options to avoid causing tension damage.Hope this helps,
Trichoptilosis, (Split Ends)