My right hand is numb and painful. What could this causing this?!

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you may have slept on it wrong or maybe. you pulled a muscle

See your health care provider as soon as possible (neurologist), for consultation.
Your favorite sleeping position--like placing your hand under your pillow--could be numbing your right arm by putting pressure on a nerve. If so, feeling should return soon after you wake up and change position. Daytime numbness in your hand most likely reflects a pinched nerve in your neck. Ask your doctor about being evaluated for disorders such as disk disease or arthritis of the neck, both of which are usually treatable with exercise, drugs, or as a last resort, surgery.
I hope this helps you. And good luck.

Numb? Painful? Is it tingly, too, especially when you wake up in the morning? Has this been going on for a long time? You could have Carpal Tunnel Syndrome, which is caused by repetitive movements of the wrist, like typing, knitting, gripping, writing, etc. and is basically a pinched nerve in your wrist. Try putting ice on your wrist, and maybe some gentle stretches, and also wear a brace on it, especially at night if it hurts very badly. Also you might want to see a doctor, he'll be able to give you pain meds and other exercises to help with your wrist, and you might want to try physical therapy too.