Hypersensitive tooth

Went for a dental filling not long last week, and after a few days, it kind of pain whenever i eat something or drink something cold/hot. Went to the dentist again and the dentist told me that my tooth becomes hypersensitive. She prescribed me some meds and asked me to see how it goes, and advised me to avoid hot and cold food. Haih.....Even after taking the medicines, still i can feel the pain whenever i eat something slightly cold or warm. The meds will make me feel really sleepy after taking it. Hopefully the pain will just miraculously disappear when i wake up tomorrow. Pray hard!!!!