Oh no
I cringed when you said you used a hairdryer on it. I hope it was on the cool setting! Anything else can exacerbate the problem. When this happened to my mac, it was the logic board that was ruined. If it's the charging port, I would guess a few hundred dollars to fix, although it is supposed to be a fairly easy do-it-yourself (depending on which macbook you have). If it's the logic board like mine, it is going to cost A LOT. $700-$1000 probably. Since mine was a few years old, I just went ahead and bought a new one, rather than fixing it.
I'm kinda thinking it's the logic board too :/ ugh im hoping it's not though. We'll find out wednesday. I paid a little over 1k of my own money for it so im hoping my mom will help me out and i just pay everything i have now. I need it for school