Bee sting swelling 1 week later...?

last friday i got a bee sting on my right hand. it was just below my ring finger. it was the first time i've ever gotten stung, and it hurt a little bit the day i got it so i took some benadyrl and put cortizone cream on it and it was fine all week.

but yesterday [saturday] , i woke up and it was really itchy so i put some more cortizone cream on it, but it was still really itchy and swelling up. i took benadryl last night and put more cream on. by this morning i had a big bump and kind of a rash between my ring and pinky fingers. also, it kind of feels like theres a little tiny bump where the sting was, could this be part of the stinger still in my hand and causing this reaction?

im going to go to the doctor, and i know no one here can propperly diagnose it, but im just wondering what could possibly be wrong. thanks in advance!