What Are The Side Effects Of Amoxicillin?

I am currently receiving root treatment for a back tooth. I was given Amoxicillin 500mg for five days. I had a temp filling and then discovered I had a small lump on my gum. I was put on another five days of Amox. I now have swollen ankles and feet, have a cough and am having trouble breathing. I am going to the nurse today to get my B/P taken. I have a feeling I have taken a reaction to the Amox. I have taken it before with no reaction.