Wht Causes The Hair To Be Sticky?

I've been having problems with my hair recently. I'm 21 years old with pcos, asthma, and I am hypoglycemic. For a while I was living in Florida for college and never had a problem with my hair. When I graduated and came home I started using our well water again and I noticed that when I got out of the shower my hair was incredibly sticky. I thought it was the shampoo I was using (which was suggested to me by a hairdresser) so I switched to a clarifying shampoo which didn't help. I went to the hairdresser and got a mineralizing treatment on my hair which seemed to help with the stickiness and they gave me a clarifying shampoo to use. It's now about 2 months later and my hair is very sticky again. I'm using a clarifying shampoo and conditioner. I'm not sure what to do to get my hair to feel clean again.