Hi and welcome to LHC!
My favorite conditioner of all time is Biolage's Conditioning Balm. It's very moisturizing and doesn't weigh down my fine hair. It is a little spendy, but Sally's makes a generic version and it is almost as good.
You may also want to try a leave-in and possibly shea butter or oil to protect the ends (depending on how your hair reacts to oils). For a deep moisture treatment I would definitely try a SMT I actually did one tonight and my hair is soooooo soft! I hadn't done it in so long and I forgot how wonderful my hair feels after.
As a last resort, you may have to simply trim off the damaged ends. My hair was breaking off so badly from repeated coloring and heat styling that I had to chop. While I'm still growing out the color, my hair is now the length it was when I chopped about 9 months ago but in much better condition.
Good luck with finding something that works. I'm sure others will help too, and you'll find tons of info by searching the boards.
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