I need to vent

Okay so this may sound weird or petty but i have an extreme fesr of the dark. I am 14 and whenever i go to bed and turn of the lights, i start sweating and feeling extremely anxious and unsafe. I always end up trying to deal with it and just laying in bed unable to move because im so scared. It gets really bad, to the point where i never get sleep and my mom makes me sleep with her thinking that will comfort me. And it has been getting worse. Does anybody have any tips..?