How would I know if it's a hallucination or if it's real? It comes and goes and sometimes I smell it in my bedroom. Sometimes I also smell it on my hands and before I thought I smelled it on my body, especially after sweating in the gym and was really self-conscious about it.

There's a mould smell when I take the plug out of the bathplug hole and sometimes I smell it when I forgot the plug is out. So if I am hallucinating I'm not sure how because of the fact that I can smell it when the plug is out without realising the plug is out. Then when I put the plug back in the smell goes away after a bit. One time I came home when the workers had been in to fix it and I smelled it when I went through the door because the mould smell filled up my place. This was without me knowing that they'd left the plug out, so I smelled it before knowing that. Then I put the bathplug in, opened the windows and the smell went away after a while.

People from the renting agency said they couldn't smell anything, neither could someone I know who tried smelling it.

How do I know if I'm hallucinating or if I just have a really sensitive nose and can smell things most others can't?

I'd appreciate any answers or input here please.