Finally after a whole week of not eating because of the pain swallowing and the burning in my chest, I am able to eat again! Doctor gave me Omeprozole, 20mgs a day which calms acid, and it seems to be kicking in. They diagnosed Esophagitis, caused by the Doxycycline. I will never take anything again without reading the leaflet and considering alternative more natural remedies!!! Just wanted reassure anyone having problems after taking this - you will be able to eat and swallow it will take a good few days. I took advice to try take down only soft, gentle foods (was all I could do to eat a mouthful of mashed potato or scrambled eggs) and I drank lots of water. Thanks to everyone who showed support via this webpage. : )