Hi, Carolyn - I too have Stg 4 nsclc and have been taking Tarceva for about a year. The rash finally became so bad that my onc. put me on 100MG of doxycycline, which cleared up the rash to the point that I've had people come up to me in stores, etc and ask how do I keep my skin looking so good, but I was getting nauseous as well, so she prescribed 8 mg a day of Ondansatron ( I think the spelling is right - it's the generic version of Zofran ) and that has taken care of the nausea.
Hope this helps.
God bless all you out there - be strong!
Laura