What Could Be Wrong With Me?

I Went To The Hospital Because I Have A Burn On My Leg That Got Infected. The Doctor Gave Me Antibiotics That I Have To Take For 10 Days. I'm Starting To Have Trouble Sleeping, I'm Dizzy, I Have A Headache, & Not Much Of An Appetite. What Could Be Wrong? One Minute I Feel Fine Then All Of A Sudden I Feel Like $hit Again.