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So I've noticed lately that along with the pain in my left arm and leg that my muscles seem to get fatigued really fast lately. Holding something like in my arm, even something lightweight, starts to hurt really fast. Anyone else have this going on?

I am not diagnosed but it doesn't take long for me to get that fine muscle burn.
Best I can find it is called "exercise fatigue" and I have been dealing with it for over two decades and it sucks.
Do anything repetitive for a bit or something that takes some strength for a bit and it hurts.
A lot and for quite a while.
I have read this can be related to MS, but then again it can be related to many things.