Bee sting

Jennifer
A week ago, I got stung by bee. I thought it was getting better, but I woke up this morning and now it's like a mosquito bite but ten times worse. It's hard and so itchy. It's about the size of a key ring or slightly bigger. I've been taking anti histamines, but it doesn't seem to help. Nor does drug store topical medicine. Is it supposed to look like this? Does anyone have any suggestions to help or any home remedies? Please and thanks!