Feeling low need an excuse

feeling really low at the moment and always upset or crying I just need an excuse to tell people when they ask so I don't have to admit the fact I'm struggling a lot at the moment , I can't pinpoint anytning in particular and I have counselling for I don't wanna say depression because that seems to extreme, but I need an excuse for the boy in talking to so I don't have to tell him this yet. Nothing too serious just so he stops asking