What Are The Side Effects Of Flucloxacillin Tablets?

Hello, last wednesday I started taking flucloxacillin for an eye infection as prescibed by my doctor. Before going to bed that night I dry swallowed a capsule before lying down and going to sleep. I was woken up in the middle of the night by an extreme burning sensation in my foodpipe, in the vicity of the sternum, I had to get up to drink some water. From that moment I stopped taking the antibotic. Since then, almost a week now, I suffer with acute pain in the same region when I swallow food or warm drinks, the situation does not seem to be getting any better. Any ideas what may have caused this and what I can do to get better? Thank you