Did it help in the end Mary@Oliver3 - I just took 2 aspirin (325 mg each). I woke up crashed today, and unfortunately only remembered this thread a little while ago, but better late than never! And after I took the aspirin, I looked up the thread and saw that you took about 1/4 of what I just did! I'm not worried about it, just am curious to see if it will help. I wish I had remembered aspirin this morning!
I'm wondering if we all experience PEM the same way - for me it's exhaustion and aches, it feels like lactic acid but it always settles in the posterior part of my body - my back, backs of my legs, it used to hit the backs of my arms, so it's easily distinguishable for me from regular muscle aches if one over does something, though it's been so long since I had muscle aches from using my muscles!
ETA: What I'm wondering is if aspirin would have any effect on what I presume is lactic acid which has accumulated due to anaerobic metabolism, which I'm theorizing is at the root of my achiness and exhaustion - it's not even really exhaustion, it's a lack of energy - I think there's a difference.