AuDHD - questioning adult

How would one know if they are burnt out?

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I ask this in this subreddet because for like the past 2 year, I've had friends and family started to realise that them and I potentially don't think like nerotipicals.

Things that are giving me signs that I might be burnt out is that in my last year of high school I noticed a decline in my memory (I was forgetting more things then before), during Uni I noticed that when I would do math (my favourite subject) I would start making simple mistakes early into my studying, that during high school I didn't start making untill I had been studying for 3 or 4 hours in. The last thing I'm less sure about (because my brain makes the counter argument "It's just you being lazy"), but when ever I'd try to force my self to do school work, or something I didn't want to do, I'd end up sitting down on my bed or a chair and doom scroll untill I did something that my subconscious wanted to do.

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So I guess my question is, has anyone else had to deal with this, and if so, what helped them? (And a secondary question, if my thoughts are right or wrong about the counter argument).