My new long hair is always brittle, dull and hard to comb, why?

I've grown my hair out but my hair is constantly brittle looking and hard to comb. It looks dull and also flies everywhere in the wind.

Usually I take only hot showers and use a bit of shampoo and conditioner in one. Something is strange though. I don't know if it's the conditioner or my hair but the product doesn't really foam anymore. It's a big bottle.

The condition of my hair is beginning to worry me.

I've also in the past two years have gone through tremendous stress more than I believe I'll ever go through for the rest of my life - maybe this is affecting the condition of my hair?
My new long hair is always brittle, dull and hard to comb, why?
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