Is your crash from going over your energy boundary or an immune reactivation? Is your crash immediate or delayed?
I don't get mild PEM. When I am in a PEM state it very serious distressful and totally disabling. I go from being my 'normal' to I want to die.
I get shades of PEM, if you’re at I want to die levels I’d call it a crash. Milder PEM for me might be immune activation, insomnia, lasting a day or two with reduced function, a crash is worse. But I’m bedridden so very little exertion sets off some symptoms which I’d call PEM , without it being a crash. I struggle to recall being mild and moderate and PEM then. I still had shades of it I think but my presentation is very immune. If people don’t have immune flares maybe it’s normal or ghastly automatic I’m dying feelings and little in between.