Parkinson’s disease causes muscle tremors, increased muscle tonus (stiffness) and slows the movements and their coordination but does not decrease the muscle strength. On the other hand any prolonged pressure on the peripheral motor nerve (pinched nerve) can decrease the muscle strength in time.
So tremors, shaking hands, and disturbed speech could be due to Parkinsons disease. But those symptoms can also be due to any other disease (cerebrovascular, brain tumor, multiple sclerosis, metabolic, poisoning, etc.) that damages the extra-pyramidal motor system in the brain (Parkinson’s syndrome). Such disorders can affect both the pyramidal and extra-pyramidal motor system. Muscle weakness is one of the symptoms/signs of pyramidal motor damage. So muscle weakness on the hand can be due to a pinched cervical nerve but also to a brain disorder.
I am not sure what exactly the MRI-scan revealed but you definitely need expert help from a neurologist.
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