my husband is 81 and has Parkinson take meds and he has had 3 times fainted and when he come to he has projectile vomiting,, the hospital said it was a sudden drop in blood pressure ,but after many test they did not know what cause it,, that was after the first time, and he has had 2 more fainting spells, the last time he stiffened his legs and arms,, he takes carbidopa levodopa ,we had just increased his meds before the first fainting spell ,I have since cut back some after the second fainting , but he still had one this last weekend ,