I am newly diagnosed with generalized mg and on bad days i feel so weak it seems my chest barely rises. i also can barely project my voice or talk sometimes. i am not on treatment yet. is this typical?

Yes: Muscular weakness is a sign of mg. It can also affect your eyelids, and your throat, involving your vocal chords, as it's an autoimmune disease, forming antibodies to acetylcholine receptors at the motor end plates, called neuromuscular junctions. It can also involve your extremities too. Make sure your doctor also checks your thyroid, as there may be associated involvement. Treatment will help you.