The itching happens when you get fungal infection
due to high sugars, even when your sugars are high for a short period. This is controlled by keeping your sugars under control and using anti-fungal treatment. Now the sensitivity is all due to constant irritation of the clitoris
. Please see a good dermatologist
and he/ she will treat you for the fungal infection and for the abrasions which have turned sensitive. This should not lead further to spread of infection in your private parts and hence I would suggest you to see the doctor ASAP. Take care.