It's been over a year myself. Same pattern as described. Wake up, burning is not present. By evening/night it's rearing it's ugly head, on a daily basis.It's onset was completely sudden. Went to bed 1 day without a burning mouth. Following day, woke up and by night I was wondering why the heck my mouth was so sore and painful.
Taste also altered, however mine's been more a metallic taste than anything else.
I'm trying to avoid foods that give me heartburn, or are highly acidic, to see if this helps. I have gone through periods of time, before and after meds, where the burning mouth is almost completely gone. Then suddenly it's back again.
I'm at a loss as to what's triggering mine, however I may have made another connection last night.... I noticed that I ate peanut butter on toast late at night, which for some reason makes me belch quite a bit, and I can feel it up my esophagus. The burning came back in intensity, so because of the stomach upset, I took a Zantac 150 that I have had around since my neuro prescribed them this year to use during steroid infusions for MS relapse. Well, an hour after taking the Zantac, the burning started to calm down.
Possibly related to stomach irritation in general? Maybe due to the stress and anxiety I was in pre-MS diagnosis, I in turn caused my stomach to begin acting up and that's translating to the mouth?
I don't believe it's any 1 factor in my case. It's a few factors working together that resulted in this if you ask me.
Diagnosed MS 03/08 Relapsing/Remitting.