That must have been quite concerning.
I am a double board certified US clinical doctor and will help you with your question.
To answer your question, this can be PD symptomology.
Please see this link
You say you have been extensively worked up.
It does not sound like a typical TIA. It is syncope which would be very rare from a mini stroke.
The heaviness in both legs is more like PD.
I suggest an exam now, and call your doctor.
You need a tilt table test. This rules out autonomic dysfunction.
That is common in this situation and often missed.
Make sure that you have also had an EEG to rule out seizures, as the bilateral leg heaviness would fit this more than a stroke.
I also suggest that it is not unwise to go to the ER at this point.
Simply because you have had this before is not a reason to delay an immediate evaluation, rather than scheduling tests later.
Although I think this is most likely ALL related to your PD, you should rule out acute events today.
The specific testing should be based on exam.
Again, in general terms, if not done: tilt table test and EEG. If there were any evidence of a TIA, they would certainly also investigate this.
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