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Hemorrhoids are dilated blood vessels in the rectum area and can cause lots of irritation (as you already know). Irritation can cause the nerve endings to get irritated as well. Nerve irritation can cause a 'buzzing' or vibrating feeling and that goes for anywhere in the body.
So your sensations you are feeling in the anus,groin and vaginal opening are most likely related to your recent bout of hemorrhoids.A partial occlusion in a vein or artery from a clot or lesion is a rare but possible cause of this type of sensation, caused by the blood in the vein or artery forcing its way around the lesion.
Other possible cause may include Nerve impingement at lumbosacral spine.
So you should do warm compresses at lower back and do warm sitz bath.
Take OTC Motrin.
Also start a multivitamin supplement containing B 12.
You can consider physical therapy also.
A clinical examination by Orthopedist can be considered.
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