mirapex is a tough drug to take. I'd consider 3X, 1 mg to be a maximum dosage, one that should be SLOWLY titrated up to.
It is not a drug for everyone. Hallucinations, sleep apneas, obsessive compulsive disorder, are the most oft mentioned side-effects. Domperidone (available in Canada) is often helpful with nausea. My hallucinations and sleep apneas ameliorated after a year. They got to be where they were liveable.
There are other agonists that you can try, some folks get good results be mixing two agonists.

YOu should insist on titrating up slowly on mirapex, (its a good idea with all PD drugs)
TAlk over your drug protocol and where your MDS is going to go with it. Be involved in your treatment. Do not be afraid to tell your doctor that his plan is not working for you.

We are all unique in our medication needs. It will take some experimentation to arrive at your protocol.

Charlie