Welcome to Phoenix Rising!
Created in 2008, Phoenix Rising is the largest and oldest forum dedicated to furthering the understanding of and finding treatments for complex chronic illnesses such as chronic fatigue syndrome (ME/CFS), fibromyalgia (FM), long COVID, postural orthostatic tachycardia syndrome (POTS), mast cell activation syndrome (MCAS), and allied diseases.
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It took a while for him to get back to "normal" when he was sick. So the symptoms lingered for a bit.
Now that he is recovered, he still has some issues from time to time that are minor and go away on their own. Probably in the "normal spectrum" and similar to other people without ME/CFS.