Basically, starting yesterday I changed a rear bulb in my car because it had blown, the bulb doesnt sit in the holder properly and has to be wedged in to stay in and stay on instead of flickering. Since I changed that everytime I touch my brakes the dipped beam lights come on, including the rear lights and the number plate light.
I checked all earths today which seem fine and took the bulb out of the dodgy holder to see if the holder was to blame. I started the engine and tapped the brakes and funnily enough the brake lights didn't work BUT the normal lights didnt come on either (Which recently the normal lights have been coming on whenever I touch the brakes). I put the bulb holder back in the rear light and now the car won't even start. I tried starting it with the bulb holder in and out and it still won't come to life

Any advice on what it may be please