One characteristic sign of MG is muscles fatiguing with use, and with a short rest, go back to normal.
MG (myasthenia gravis), can have a tumor in the thymus, which compresses the windpipe and esophagus. This is called a thymoma.
Thymoma - Symptoms and Signs | Cancer.Net
So far you have posted at least 3 of these symptoms so far here.
This is not common, and usually benign, but may rarely be a cancer.
MG is an autoimmune disease.
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Weezie looking at petunias 8.25.2017
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