C.W.
My 11 month old has had fevers, lethargic an clingy and cranky for several days now. funny, I just posted on facebook is there a new flu going around because my 8 year old just started with it too, and one of my friends said her baby had it last week. So you may have 2 different issues--a virus, and constipation and maybe rash related to milk. My daughter has had a rash too but I swear it is related to teething. I guess you will have to wait and see. Maybe give her the formula and then try milk slowly when all this clears.