When im reaching the climax i always get really dizzy and my finfer gets tired so i cant carry on what should i do and is this nofmal
Drink lots of water before hand and pee. Then make sure the room isn't too hot because hot rooms and getting hot (in the non arousal way) can make you feel dizzy. If your finger gets tired you can always hump a pillow instead or use a loose shower head or a vibrator or use a vibrating toothbrush :)