What you can we do

• Exercise is a 2 edged sword, it can lead to exhaustion if overdone, but regular gentle exercise is beneficial forthe muscles and general welbeing.   Listen to your body
• Food - watch what you eat and see if anything consistently worsens the MG symptoms.  Milk and milk products may do this.   But if foods do not affect your symptoms, and you enjoy them, then by all means eat them, despite what some web site says. 
• Eat foods rich in potassium as this may help muscle function - bananas and fruits, fish and poultry. 
• Alcohol in moderation should not cause any problems, but if you feel worse dont, but never more tan a glass or two. 
• Coffee among other things has a mild anticholinesterase activity like Mestanon.  This could make you feel better and stronger, but could also increase some of the mestanon side effects (cramping and diarrhoea). Like most things it is trial and error with MG, if it helps and you like it have some coffee, if you feel worse stop.
• Avoid STATIN drugs - these can make the symptoms much worse