The reasons for your numbness
during treatment for diabetes
seems to be more due to probably hypoglycemic episodes.This episodes could have been brought up because of skipping meals or consumption of alcohol.Even older anti diabetic drugs were more responsible for hypoglycemic attacks.
You should consult a diabetologist
and take a proper treatment from him,after a thorough investigation.
Take small frequent meals.
Stop consuming sweets unnecessarily.
DO regular exercises
There are plenty of newer oral anti diabetic drugs which have much less side effects
Take VIT B 12 supplement orally or injectable.
Avoid any herbal preparations as they may damage your kidneys.
Control your blood pressure and cholesterol
Meticulous control of blood sugar levels are very important for you to avoid future micro as well as macro vascular complications.
Make sure never stop your anti diabetic medicines of your own.