Hello desperateforadvice, welcome to healing well forum. I totally agree with zinniagirl here in that you need to get your mother to another doctor for a second opinion. I dont think that it necessarily needs to be a psychiatrist so much as a medical physician. The thing is that she is taking several medications and what could be happening is that she is experiencing drug interactions from the mixing of so many meds. This does happen when you have someone who takes so many and it is hard to tell which of the 6 is causing it. She shouldnt be having tremors unless she has a medical condition such as Parkinson’s that would cause this and you havent stated that she has this so I would say that it most likely is a drug interaction and she needs to see a doctor ASAP.
Please do post again and let us know how she is doing. We are always here if you ever need anything...take care