Hi Mango and Welcome to NT!

I can't imagine how frustrated you must be. Many of us have some experience of doctors trying to tell us that what's happening to us isn't happening to us. GRRRRRRRRRRR!!!!!!

I'm afraid that unless you've suffered a head injury, I don't have any idea what might be triggering your speech problems. Have you talked to a Speech Language Pathologist about your issues? I doubt it's a "language problem," but it's possible that they may have encountered something similiar in other patients and have some idea what's going on and who you need to see.

You might also want to check our NT's Rare Conditions Forum. The link is:
http://neurotalk.psychcentral.com/forum2.html

Good Luck