First let me address the cat's problem. Her hair lose is likely an allergic reaction to the litter you are using. Litter manufactures keep adding chemicals to the point they are poisoning our cats.
One of my cats chewed out all his hair on his belly and legs. Suspicious of the litter I switched to the most basic none clumping litter I could find. It took a while and now his hair has grown back. The unpredictable benefit was that there is almost no litter box smell now. I pay 8 dollars for 50 pounds. I only put in just enough litter to be useful and then dump it completely when it becomes soiled. Saving me big bucks.

Your issue: I had the vibration issue also. It happened all the time before I realized I had parasites. Once I started treating the parasites this "buzzing" went away.

Low calcium and low D is like hanging out a "body available" sign to the parasites. I had no idea either. Start building up both immediately with Boron and Vitamin K.

I have no idea which parasite causes the "buzzing" but it really didn't matter to me. If you have one unwelcome guest you probably have many different types. Ascaria are the most common that cause IBS symptoms. Your poor cat undoubtedly has them also. Give the cat 1/2 ML of PINX every 15 days. It's pretty much a harmless med.

Start with Pyrantel Pomoate (PINX) while you read everything you can on CZ about parasites. I thought this step was worthless but it is what is recommended. It paralyzes the parasites so they are passed in a BM. The problem with me was that I had so many parasites the PINX stopped all bowel activity. I went to Fenbendazole. Passed pounds of ascaria for days. Ugly business.

There is no "could I be a host" YOU are a host. We all are. There are lots of answers on CZ. Please make sure you understand what you are taking and why. Don't just do something because someone told you to. I warn against herbals because they don't kill the parasites immediately and the parasites will do some very terrible things to you when they are trying to escape the herbs.