Hello,
I am a 32 y/o male who was diagnosed first w/PD 4 years ago and then about 6 months ago was ID'd as Bi-polar so yes it is possible to have both.
I take Stalevo, Mirapex and Azilect for PD and I must use will power and therapy to fight the side effects of Mirapex but I need it. For Bi-Polar I take Lithium Carbonate and thats all although my shrink wants to put me on additional meds to quell the BP but I have not had good experiences with additional psych meds.
I do take an RX sleep aid as well and it has helped. Hope that gives you some answers.