CLKD, apologies, I've just seen the message you sent me. Haven't been around here for ages. Someone mentioned the slimy sensation, which I also get as well as the pain. I also sometimes have a feeling that the inside of my mouth is covered with a think layer of plastic. The pain keeps moving around and changing character.
Someone asked about Nortriptyline, which I took for about three years and eventually stopped as it wasn't helping. But some people find it very good.