Sorry, pressed submit too soon....
Eat what you feel like eating and try to give yourself some treats, whatever a treat would be for you.
Do try to stop blaming yourself for being ill...it really doesn't help , nor does thinking of other people who have 'worse' lives than you....just makes you feel worse about yourself.
Mainly, given that you are already going for walks etc it is a waiting game for a wee while until you feel some energy and motivation returning.
Also.....please, please keep taking the meds well after you start feeling better. They have a kind of delayed action and you continue to feel well for a week or two after you stop them, then your mood can drop like a stone....not a pleasant experience.
Chin up. The other thing about depression that I hope your GP has told you is that it always gets better....even untreated....it's just the length of time it takes (and of course the severity of the symptoms) that the tablets influence.
You really will get better....honest.
:-))