Christians were told by Jesus that anyone who wanted to follow him must take up his cross and follow him. This does not mean looking for suffering, such as martyrdom, a practice that is strictly forbidden, but it means facing up to life's duties and troubles without compromising your Christian moral standards. Ill-health is a cross that we all must bear and do so according to moral standards.
Bearing the cross involves not slipping into selfishness. It is easy to slip into the mind set of thinking that your illness gives you some kind of priority on attention and precedence over others. It is important that you recognize that others have needs as well as you do and that while your needs are strong not every need or perceived need or desire of yours is priority. Bearing the cross means disciplining yourself to avoid self-pity, which is a spiritually deadening form of egocentricity. I discipline myself to look at others who are worse off than I am, and there are plenty of them.
I am trying to be a good Christian, and this is a demanding task. I think it important to count your blessings. I have a loving wife and family, good friends, a supportive community, a peaceful country to live in, a comfortable home, food and warmth, interesting things to do and enough money for my needs. Moreover, While the average age for developing the disease is 56, I showed the first symptoms in my late sixties, so the disease has not as much time to mature with me as it does with many others. When I asked the consultant how long before I reach stage 5, his reply was, "You are not going to live to 120, but you are good for another 10 to 15 years." Considering that I am 71 that will be sufficient.
Trying to blame others for your woes is a form of displacement. True, a young doctor misdiagnosed my problems as orthopaedic some years ago, but she put me through the Parkinson's checks, and I passed them. So she misinterpreted the main symptom, my gait, as an orthopaedic difficulty. I am uninterested in blaming her, the mistake was reasonable and failure to recognize early Parkinson's is a major source of misdiagnosis.
Responding in a spiritual way involves not giving in to the side-effects of the medication, which can make you more impulsive. The consultant warned of people who gamble small amounts suddenly gambling large sums. However, as I do not gamble at all this will not be a problem. But the warning is useful, for I will add prayers for self-control to my daily regime.