Welcome to NT, Miss~A~!. I've had MG since the mid 70's. Back then it was considered to be a potentially fatal disease. I was turned down for insurance more than once. However, new treatments allow most myasthenics to live a fairly normal life. Of course, you have to learn that normal for you is now different. You may not progress much beyond what you now have. Or you may progress. Like Gabe said, we're all different. If you find yours is progressing, learn your new limitations. Stay active, but don't over-do it. Watch out for the triggers: getting too hot, getting too cold. Check out the info in the stickies at the top of the page. There are some medications we have to be careful of. They can exacerbate MG. You may find it helpful to print off a list of them and take it to your GP. And do educate yourself.
Hugs,