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I am sorry to hear of your anxiety. Myasthenia is progressive and will worsen with use. A stroke would be unilateral. Myasthenia also would present as a one off and would be a progressive problem over months.
Fatigue will make it harder to open your eyes.
As a problem today I would suggest this is nothing more than fatigue
Nothing. It doesn’t demonstrate a breathing problem
Breathing manually implies you are making the conscious effort to do this, you do not need to
If you have leg swelling then that is very likely to be unrelated but should see your doctor about it unless you have already