Hi @Bimby2,
I suffer from anxiety and it comes and goes. As far as I can tell, it has a mind of it's own, because some days I have absolutely no idea what has triggered it. When the anxiety is not there I feel very relieved, which is an extremely pleasant experience for me.
A lot of days I don't feel happy but I know that nothing is wrong either. They are 'neutral' kind of days. On these days I can tip myself over into happiness if I do something really nice for myself - like doing some art or cooking my favorite food.
I agree with @Appleblossom in that we can't expect to be happy every single day. I think it is more reasonable to aim to be content. So that even though a few things might be going wrong, we know that we will cope and that everything will basically be ok, even if life is not how we imagined it should be.
I guess it depends on how bad a 'down day' is for you? When I have down day-
1. I accept it. Everyone has down days.
2. I formulate a plan to deal with it. I get out of the house. I think about wonderful things I want to do in the future - like travel. I call up a friend. I sometimes go online. I exercise.
3. I pat myself on the back for taking action.
I hope you are feeling better. Let us know how you are.