How can I fully get my curls and volume back?

My hair used to be really big when I was in high school, and then when I graduated my mom bought me an iron and I started using it on my hair for three or four months. I lost most of my curls and volume. I have been without heat for 7 months NO HEAT! My hair also stared falling off non stop. I Have been drinking biotin and a lot of things but none of them works. The doctor says it is the stress, but I just want my hair back, I miss him so much. 

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