Michael J. Fox is staying optimistic in his battle with Parkinson’s disease. The “Back to the Future” actor, 65, gave an update on his well-being as he continues to deal with the neurodegenerative disease. “I wake up and get the message of what the day is gonna be like, and I try to adjust to it,” Fox told People in an interview published Wednesday. “I keep getting new challenges physically, and I get through it,” he continued. “I roll around in a wheelchair a lot, and it took some getting used