Allegra and zyrtec

I've had prescription Allegra for over three years now for my seasonal allergies. (Michigan in the spring can be such a pain. XD)
It does not seem to have the side effects Zyrtec had on me, which were headaches and dizziness, nor does it make me as drowsy as when they tried me on claritin.

The oddest thing Allegra does is flatten my hair, completely. My usually wavy, thick bouncy hair goes very flat and droopy, and maybe even a bit thinner whenever I absolutely have to take it on the worst of the spring days.

I also notice that when I discontinue the pills, my allergies appear to become even more severe afterwards, and on some occasions my body has started itching, which seems to indicate they DO cause a dependency.

Otherwise, Allegra seems to be very useful for keeping the symptoms at bay for the entire day, unlike the non-prescription stuff that just completely knocks you out.