Did Vincent van Gogh suffer from paranoia?

He may not have been schizophrenic at all. Different theories have emerged through the years, that he suffered from lead poisoning (from the lead-based paints he used), Bipolar disorder, overuse of absinthe, syphilis, and even porphyria. He was treated for epilepsy, and suffered seizures through the years; some of his symptoms could have been side-effects of the medication he was given.