with long covid, i experience nauseau when doing anything quuickly including walking or even cleaning my home. it becomes less when I do things slowly. I do not experience a PEM crash. Is there any solution to this.

The short version: your pattern fits a breathing-control problem, not a muscle-fuel problem, and the fix is pacing plus breathing retraining, not pushing through.

Your nausea on speed fits a specific finding. In non-hospitalized long COVID patients, the reflex that controls breathing is over-reactive: they breathe too much per breath when oxygen dips, and 64% had inefficient breathing during exercise versus 7% of controls, with no actual lung or airway damage [3]. That points to a control problem in the brainstem and carotid body, not weak lungs. Moving fast raises demand suddenly, and an over-reactive breathing reflex can overshoot, which can produce nausea and lightheadedness. That is a plausible mechanism, not a proven cause of your nausea.

The exercise literature here is thin on your exact question. Of 46 long COVID exercise trials, none reported how they managed post-exertional malaise, and 57% did not report adverse events at all [1]. So the evidence base for "exercise your way out" is weaker than it looks. What does exist: a 6-week supervised program improved walk distance and fatigue versus education plus breathing exercises, though the control group also improved [4]. Deep breathing exercises improved lung capacity over two weeks [2].

My call: keep doing things slowly, add daily slow-breathing practice, and ask for a breathing pattern assessment before any exercise ramp. Confidence: low to moderate, because no retrieved study tested speed-triggered nausea directly.