Can prescription or otc drugs that cause vasodilation worsen peripheral neuropathy? i have had to stop taking norvasc, (amlodipine) garlic, and ginkgo biloba due to this.

Yes, possibly: Peripheral neuropathy often comes from damaged nerves sending aberrant impulses--tingling, pins/needles, burning, cold, or numbness. Vasodilation which increases blood flow to peripheral nerves usually helps restore normal function of the nerves; sometimes an undesirable side effect is for numbness to lessen, unmasking more painful neuropathic sensations.