this definitely sounds like black mold to me.cold and shivering is exactly how I react to mold toxins. Not sure why that is.
Do you work in a large office building? If it's not too large you could try hunting down one or more of the sources for mold. could be a section of the carpet that somebody spilled something on that could be torn out and removed or something like that.
however, it could also be sick building syndrome, i.e. the entire building is infested with mold. If that's the case you might want to start looking for another job
These are frequencies that help me with mold detox. You can try that they might help you too