How can I repair my damage hair in less then 2 months without having to cut my hair?

Well i started straighten my hair not so long ago, i straighten night & day & now my hair is badly damaged i have split ends it is frizzy & it feels rough especially my bangs well mostly my headline/ baby hairs that is where the most damage is at it is so dry i have tried many products but they show no result. & my hair is really thick & also my bangs & the ends/tips feel like an old used up broom. Help please.