My 2 fingers starting feeling very numb all of a sudden and than turn white. What causes that?

Might be a trapped nerve and/or blood vessel- which two fingers are affected? Might be Thoracic Outlet syndrome. You can check with a doctor or Physical Therapist.

Thoracic outlet syndrome affects the space between the collarbone and first rib (thoracic outlet). Common causes include trauma, repetitive injuries, pregnancy and anatomical defects, such as having an extra rib.
Symptoms include pain in the shoulders and neck and numbness, weakness and coldness in the fingers.