I suffer these vibrations and they drive me mad, I have them 24/7 from my butt through my legs and into my feet.
I also have spinal myoclonus, my neuro has never mentioned neuropathy to me so your post has been useful to me as the doctors reply was informative.
I hope you get answers and find out what is causing it.
Feel better
Suz
Without the ability to take a history and examine you, I can not common on the cause of your symptoms. However, I will try to describe some conditions which cause burning and tingling.
The cause of burning and tingling symptoms depends largely on their distribution: what parts of the body they occur in.
The vibration sensation may be a form of neuropathy (i.e., nerve injury). Since it occurs with sitting, I would guess it is a compressive neuropathy of one of the nerves arising from the lumbosacral plexus (i.e., bundle of nerves supplying the buttocks and lower extremities). If you develop pain (either localized or shooting) or weakness, you should be evaluated by your local physician.
Thank you for using the forum I hope you find this information useful, good luck.