In my first year or so, I had several temporary remissions, although they lasted only 'for the rest of the day'. Over the next few years I had occasional temporary remissions triggered by a few different things, such as prednisone, cumin, and T2 (or iodine). The remissions didn't lead to any way to maintain them or trigger them on demand; they just boosted my state of mind by proving that it was at least possible to get free from the symptoms. I haven't had one in ten years or more. *sigh* I miss my temporary remissions.
I think of ME as being an abnormal state that we can get locked into. It's possible, especially in the early stages, to temporarily break out of that state. Being completely evil, ME finds ways to prevent us from getting out of the ME state even temporarily. I suppose it's possible for some people to break out and stay that way, but that means that they believe that they 'just had a bug' or whatever, and thus never get counted as people who developed ME.
It's possible that if you did exactly the right things, you might keep getting remissions or even avoid further ME ... but no one knows what the exact right things for you are, so don't stress out about it or later on blame yourself for not doing whatever it is you didn't know you should do. In the meantime, enjoy your temporary remissions, and keep notes on what might have triggered them or caused them to end (and hopefully post them here so maybe we'll learn something that might help someone else).