Car is shaking..?

hi! 

so i hit a couple pot holes 2 weeks ago, & ever since, my car has been acting funny. it starts to aggressively shake when i hit 45+ miles but it comes and goes. not sure if hitting the pot holes messed up the alignment. the whole front of my car starts to shake, my seat & steering wheel. i drive on a highway, to & from work & i get nervous bc i don’t know how serious this could be. could it be the alignment? or something else? i’m taking it to firestone today to get it looked at, & i’m hoping it’s nothing serious..