Hello Colcol and welcome to the forum. I was diagnosed April 2012 age 51.
I remember being nauseated when I commenced medication, I was prescribed domperidone and this really helped,if you are not already on this it might be worth speaking to your Neuro, Parkinsons nurse or GP about this.
How long has your brother been diagnosed? Perhaps he could give you some tips around your medication.
You say you go to bed not much later than 6pm do you sleep all night?
You are correct to stay positive and take each day as it comes, you never know what life will through at you
You will find loads of help and support here, hope to see you around the forum.