He did admit to being on a new weight loss drug https://www.thequint.com/fit/elon-musk-uses-this-diabetes-dr...
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GLP-1 agonists aren't stimulants and don't tend to cause this kind of side effect. Although I guess stomach cramps could cause bad posting.
Constipation, nausea, and irritability are the symptoms I've had.
I would just think he's maybe tired and burnt out. This is classic burn-out syndrome here.