Feel like I am always ill & no idea why. Have had multiple bouts of norivirus over the past couple of years. Last one was in February while I was on a weekend away in London. Often feel nauseous & have an upset tummy. Started again today & im sick of it. Don’t think it’s noro virus this time but running to the loo all the time & just feel wiped out with no energy. Im in my 50s & eat well & exercise. Never been ill really until now.