I have just summoned up the courage to look again at my tongue and, yes the groove is real enough, but it does line up rather conveniently with one of my teeth, so I guess it is just the same as the scalloping effect after all.
I wish I could be reassured about, slurring my speech though,
Now look how long I am going to have to wait to be reassured.
I just hope that the slurring is only fatigue and anxiety.
I seem to have adopted yet another compulsive habit, that is if I mispronounce a word in a sentence, I go off as soon as possible and repeat that word as many times as I can to make sure that I can at least pronounce it in isolation, not sure what that is proving.