Ann,
I am so sorry to hear that you are struggling with so many issues right now. I truly wish that I had some words of wisdom to offer you, but I do not.
For me my parkinson's did cause weight loss, but I think it was more the medication than anything else. I have tremor in my right hand and some dyskynesia, but nothing major; at least if I keep on my medication. I take Stalevo and Sinement three times per day.
My thoughts will be with you and I hope that the doctors will be able to piece it all together for you quickly, and that maybe there will be a medication that will give you a little relief.
God Bless!