Please don’t tell me this is mold..

I was traveling for 5 days and my husband only used the machine maybe 1-2x while he stayed home alone. Usually I’m making 1-2 lattes daily so it definitely was sitting unused for a few days. I made a cup last night when I got home and it tasted really weird. Lots of this black stuff floating in my coffee. I’ve done 4 clean cycles now and it’s not improving much. I did have another cup after two clean cycles not long ago. Again, it tasted funny, then I got really nauseous not long after.