Could Quivering In Body Be Due To Furosemide And Omeprazole Drug Interaction?

My mom takes the following drugs: furosemide, omeprazole, warfarin, L thyroxine, and Lanoxin. She also takes liquid calcium and magnesium, vitamin E, CalMag. She says she wakes up at night and she feels her whole body is quivering inside. I did a drug interaction and the report confuses me. I suggested she take only her prescribed meds for several weeks and then add the other supplements one at a time. What would you suggest?