I'm having extreme leg cramps and feet cramps and also in some of my fingers?

Dehydration. Cramps can simply be from dehydration or fatigue. Things to worry about would be early neuropathy symptoms like burning and tingling as well as cramps. I would see your doctor and have some labs checked as well as a good neurological examine.
Anything extreme. Is never good, etiology of cramps includes dehydration and vitamin deficiency such as low potassium or magnesium. Due to the fact it was extreme you may want to consult an internist.