I f*in hate this car.

I say walk away for a little bit and chill.
First off lets get that cap back on,when you pulled the cap maybe the rotor got pull up and turn on ya.Try pushing down on the rotor and wiggling back and forth,and like the others said make sure the clips and nothing else is in the way.
Also if this is recurring problem start off my telling us what motor you got and what it is doing there are so many variable so the more info the better.
Dude me and others can fix that car on the internet if you are willing to do as we tell you.
Hell it could be a bad ballast,bad ignition switch,fuel filter......
Post picture of the cap if you can not get it back on...
Ever been so angry that you were blinded to what is right in front of you....
Just Chill......