Good morning, I hate to hear you are suffering so much with this. I have not had this happen {I do get tongue swelling but not stiffness} Listen to Annie {she is always right} I hope things get answered soon. As for it maybe being another disease, sadly we with MG seem to always have "something else" which makes it harder for us as we never know if it is MG or the "something else" Good luck at the Drs tomorrow and I am sure I speak for us all when I say we will be waiting to hear what happens and you are in our thoughts.