I hear an eating disorder can shrink your muscles which soon it gets to your heart (which is a muscle)

But when I hear stories about people in the past who once had a disorder, they were on it for like at least 2 years?

So my question is, when will it eventually kill you?

Can panic attacks cause excess levels of catecholamines in urine tests?

I realise that excess levels may indicate a hormone or adrenaline disorder, but in simple, plain panic attacks/panic disorder – is this likely to raise catecholamine levels?