Hello, My Father Is 90 And Has A Pacemaker. I

hello, My Father is 90 and has a pacemaker. I was talking to my mother on the phone and my dad entered the room and said the house was vibrating. He went outside to see if there was a truck idoling or a helocoptor and there wasn't. He felt it in the chair and walls and when he touched their vehicle. He said it was less in his hands and more thru his feet. He says his chest is not vibrating. He has been diagnosed with an irregular heartbeat and he was put on Kumadin(sp) and he has been having the levels checked and the dose adjusted. He also wears hearing aids and took them out and it didn't stop.