hi primmy ..
unfortunately i'm in the same boat as you...
i'm no longer on tarceva ..but was for 6 months ..and my hair thinned ..
i took the herbal tablets ..the ones that cheryl Baker advertises and they're brilliant..my hair now is actually thicker now than before i was ill!
so give them a go ..and good luck..
they're called Nourkin...
Best of luck with everything
Kind Regards
Linda