I sometimes do not eat when stressed or anxious and I agree that it is important to distinguish between that and losing weight if still eating what should be enough for your needs
I would phone the GP surgery now though while you have Covid, tell the receptionist that you are concerned and either speak to a nurse or dr to advise you while ill and get an in person app for say 10days hence so you/they can follow up with you
In my own case I have to be careful not to spiral and have developed various ways to stop that happening - some are self-help, others involve other people
because it can be stress related I think it is important that you get others’ help and support to build a sort of ‘help scaffold’ around you - esp right now while you also have Covid
in the meantime you could try this which worked for me:
set numerous alarms on your phone to prompt you to eat throughout the day - use songs or tones or record your own phrases (if you can do this on your phone)
the thinking for me here is that when I hear the alarms it’s not a foghorn going off but a pleasant thing that will make me smile
songs are particularly good because there’s the encouragement to sing along which has an added effect of getting your mouth and jaw moving and ‘limbering up’ for the movement of chewing and eating
even if all you eat is a cracker & bit of cheese or watered down fruit juice or a couple of grapes or whatever to start with you might find it helps your body remember eating
(I don’t know how else to explain that - my dr said the shakes or liquid foods could become a crutch so better to keep trying with biteable, chewable food with various textures and tastes)
I hope you get some good advice and support from your surgery, recover from Covid, and get back to enjoying eating again soon 💐