I'm sorry honey, I don't know what all that MRI lingo means!!! But I do know that a neurologist should be able to tell you if the are still active or not. Apparently they do appear brighter on the MRI when they are active, or so I have been told.
It sounds like you still have a lot more tests to go through before you truly know what's going on, keep your head up, and ask them to repeat that mono test. Remember, legions can be caused by something as simple as a fever, your MRI results are not necessarily indicative of an MS diagnoses, and fatigue can be a symptom of so many other things.