how did this happen !?

y
I dye my hair, not often. I had color in my hair and went over it with blonde to take it out years ago. This made my hair start to grow in brown. I wanted to stay blonde so I've been going blonde since. I only dye maybe every 2-3 months if even that. I've been trying to grow my hair out but about 2 months ago on the right side I had major hair breakage. Only leaving with a very thin strand that stayed original length. I really really don't want to cut my hair. 
Is there a way for me to keep it long and have it grow faster ?? I've been reading a lot about castor oil. Would that help? 

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