Wolram, I think it would be a very good idea for you to get evaluated by a neurologist, not by a different psychiatrist. There are many, many neurological problems that sound like psychiatric problems: all kinds of weird illusions and unexplained mental events that would make a person feel like they are going crazy.
The average general practitioner and average psychiatrist has never heard of most of these things. They aren't taught about them because they're not psychiatric problems.
Here in the US things are getting better: psychiatrists are slowly becoming aware that neurological and organic causes of things that sound, on the surface, to be "mental" problems, have to be ruled out.
Oliver Sacks' book, "Hallucinations," for example, is a whole book dedicated to a huge variety of hallucinations that are organic and neurological in nature, but which could easily be mistaken for symptoms of a mental illness. Did you know, for example, that people with
migraine sometimes hallucinate seeing tiny, Lilliputian figures? What psychiatrist or General Practitioner knows that off the top of their head? Do most neurologists even know it?
http://www.ncbi.nlm.nih.gov/pubmed/11843872
But if someone went to a psychiatrist and said, "My problem is: I get these terrible headaches, then these tiny little men appear and start dancing around." the psychiatrist is going to say, "SCHIZOPHRENIA!" A neurologist is much more likely to find the actual neurological cause.