Fell down 6 steps hurt my tailbone can hardly move but now my lower stomach/pelvic area has a vibration feeling like a phone why?

You may have: damaged some nerves which run down your spine and may have been "bruised" along with your coccyx!!! Try hor baths!! They can help a good deal at this point! Hope this helps Good luck!!

Speculation: Since you landed quite hard, it's likely that you also strained some ligaments in your pelvis and/or sacroiliac joint The sciatic nerve may also be involved. If you're unable to weight bear, have serious pain or other "weird" symptoms, you should seek medical care & get x-rays. Otherwise OTC pain meds like Ibuprofen, ice to the injured area & a few days of rest may be all you need.