Surely this is just unrealistic advice on the NHS covid page

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Have covid at the mo and was reading this NHS page on how to look after yourself at home

It says to contact 111 or a GP if you’ve lost your appetite or feel very weak, achy or tired. Are they having a laugh? Surely these services are massively overstretched and won’t be able to do anything for these symptoms anyway?

The way I read that is to call 111 or GP if you experience that as well as other things. It's all about common sense isn't it. I had covid recently and felt horrendous. Not felt that ill in a long time. I managed it at home though.