The GI issues are some of the more bothersome ones with autonomic dysfunction and PD. Severe GERD put me in the hospital overnight as the symptoms were severe enough to make everyone suspect a heart attack. The gut slows down and GERD and constipation and bloating cause misery. A regimen of Miralax nightly with Senna tea every 2 to 3 weeks as needed helps significantly (approved by my gastroenterogist). Good luck and hang in there.