What are symptoms of systemic yeast infection for a guy?

Complicated: What yeast are you referring to? Histoplasmosis, blastomycosis, cryptococcosis, coccidiodomycosis and other systemic diseases are all yeast infections. Symptoms are not specific for any and require detailed testing to establisha diagnosis. If you are referring to candidiasis then this virtually never occurs in a person with normal immunity or outside a hospital. See a doctor asap.