I agree with the above it could be a smell hallucination.
Or could be a side effect of physical illness if you have not been very well.
I have a stomach problem and when it gets bad/I don't take my stomach meds I get sick with any smell even nice ones and sometimes think i smell bad smells.
It's difficult to say weather it's physical health of mental health but it would be worth speaking to your gp about because if he/she can manage the nausea then you may be able to tell which it is down to.
Ie if the nausea and appetite goes back to normal and your still smelling it there is good evidence to believe that could be a hallucination. Or vice versa.
Def think about speaking to a doctor x
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