I have episodes as described here and have mentioned it to my neurologist and she never addressed it. I take five different meds for PD.: Pramapexole 1 mg ; Cardidopa-Levadopa 25 mg-100 mg; Amantadine 100 mg; entacapone 200 mg;and Namenda 10mg. This my 2nd neurologist. I just try to be careful when rising from a bed or chair. And there are times this happens when I tilt my head to look up. I have had MRI's of my brain that say nothing wrong. It can be frustrating at times. Thanks for the link Jewel. I may take this to my next appt. and see what the Dr, thinks.