Just wondering if someone here has a foolproof way to diagnose if you are currently in a crash or not, like unusual heart rates? Blood Lactate levels?, etc... especially to differentiate from being sick, flare-ups from other diseases, or interactions/tapering with medication. Also, in the morning, I generally always feel bad, so it can be tough to diagnose. For example, yesterday was a bad PEM day, and this morning... I felt bad, but better than yesterday... so I assumed my PEM was over... but a couple hours later, I realized the PEM was still going strong. The reason diagnosing this early in the day would be valuable to me, is so I could plan my day better. On PEM days... I need to just hibernate; on non-PEM days... I can get simple tasks done... and my brain-fog isnt too severe.