I bought an 03 van Geico sold me comprehensive insurance. which i thought was full coverage. i went into a diabetic comma while driving got into an accident. that's when Geico said i got the wrong ins?

Comprehensive coverage differs from collision coverage, although both are components of what is known as "full coverage". Comp covers damage done to your car not as a result of an accident, such as from a falling tree, weather, or "acts of God".

You did not necessarily have the wrong insurance, but you did not have the insurance you needed for an accident.