Dry hair...

Hi. I'm 27 years old, I have thyroid disease and my hair is much thinner then it ever has been and the last like 4 months my hair is super dry, no matter how much conditioner I use or different kinds its still super dry almost like straw, I haven't dyed it in over 5 months. Anything u can think of that may help? Even fresh out the shower I can barely get a comb or brush thru it, it literally makes me cry because my hair used to be so pretty and easy to take care of.