I occasionally experience a PD symptom of severe drowsiness/tiredness. I usually go to bed and lie down when the symptom is actively manifesting. I will not do any work. The time goes without any productive work as I rest for the symptom to relapse.
The other day, I tried a different thing when the symptom showed up. I experienced more pain when I paid attention to it. To divert the attention, I visualised that I am a soul, a tiny point of energy, standing 3 feet away from my body. I could experience the self as a point being of energy/light. As a result, I stopped sensing the pain.
This technique could be adopted to face fears, tensions, worries, depression, etc.
Parkinsons recovery on untrodden path 