I have been prescribed Doxycycline 100 mg twice daily for blepheritis. I am now finding that I am very nauseous and sometimes feel like I may throw up after taking this drug. Does anyone know if this is dangerous for anyone with my issues to take this medication? I am on Carafate 2 x daily, Protonix 2x daily, and a Zantac 1 at bedtime, from my gastroenterologist. I welcome any help. Thank you.