I had this too! I used to get stopped all the time when younger and asked to model for various hairdressers, but when I got to about 37 is just dried up! sob! but also 
I've got it back though, mainly doing things that have already been suggested:
Switched to a moisturising, decent shampoo (redken allsoft in my case, massive one from ebay)
Use deep conditioner ALL the time, leave on for 15 mins (using Umberto Giannini Spa Rituals Moisture Replenishing Hair Mask from boots - the smell is amazing) here hairdresser told me to slightly towel-dry hair before smothering it on and wrapping in towel
while still wet smooth on a couple of pumps of the eye-wateringly expensive morocan hair oil
And finally, was lucky enough to be GIVEN a bighair by MIL who had bought one trying to replace her old hot air brush and unaware of the size of the barrel
I'll try and put a pic of my wedding hair on my profile if I can (the result of all this investment!) - you'll have to imagine the straw-like frizz that it was before :)
I was amazed, I never really realised that one CAN affect the condition of one's hair so much - but I suppose you can ruin it, so why not improve it too?
Oooh, I took a 'hair skin and nails' supplement too...
Good luck!