1998 Chevy Camaro 1998 dead battery

Hello, I have a Chevy Camaro 1998. Like two weeks a go I ended in the ditch of the highway and apparently nothing happened. I could drive home but the car was losing power, was like I was driving with the break on and some lights went on suddenly. Well, next morning the car didnt start, I bought a new battery and it started but next morning (again) the car didn't make any electrical response. I am going to take it to a electric car specialist here in my town but. Do anybody there know what happens with the car? Is like the car is spending the battery over the night. I guess there is a direct relation with the previous accident right? In any case, would be very expensive to repair the damage? Thanks much