Cambridge is notorious for having hard / mineral heavy water compared to Somerville and the city of boston in general. My hair reacted the same way when i moved to east cambridge and i thought i was going crazy. I got a shower head to help a bit (mostly helped with the pressure honestly) and just resorted to splashing some bottled water in my hair after a shower to ease it a bit. There are filters for homes though (expensive) and I've heard mixed things about the shower head filters. Best of luck!