Sounds like more may be involved than PD. You may have PD-Plus Syndrome.

If the dopamine helps you, consider requesting a Dat scan to give your doctor more information about your illness. You might also consider having a genetic test of you Parkin Gene by Athenea Diagnostics. About 50% of young onset patients have a mutation. I had two. The more information you can learn about your particular symptoms the better you can team up with your neurologist to clarify your diagnosis. After that, you and your doctor can decide on what course of treatment is best for you.

Good Luck,
Vicky