Hi, and welcome to the site. I dont understand the ,,between fingers part.. Are your hands or feet cramping? Leg and feet cramps can be a sign of poor circulation. Muscle cramps can be a sign of dehydration. That is something we have to watch because of the many visits to the bathroom. Low potassium levels can cause loss of muscle control that feels like spasms. I think you may need to talk to your doc..
If we would read the secret history of our enemies,we would find in each mans life sorrow and suffering enough to disarm all hostility.