Some perspectives on

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Anxiety is your fight or flight response, and it's useful to have, without it we'd all end up in unnecessarily risky situations. If it's on most of the time however it can feel awful, but it's important not to demonise anxiety, in fact fighting against anxiety is a really good way of keeping it going. Learning to work with it and to soothe it can be a more useful and lasting way to bring persistent anxiety levels down for good. 

For millions of years humans have evolved living as part of deeply interconnected groups or tribes, our biology feels safe when we feel connected, if we were rejected by our group in the past there's a very real chance we'd die, we wouldn't last too long in the jungle or the desert on our own. In today's world we know we'd survive, and that on some level we don't need to care about what others think of us, but If we feel on the the outside of groups, or fear that we might be rejected by a group out biology can respond as if we're facing an existential threat, and that's why the anxiety can feel so strong and debilitating at times. 

Depression is one of our brains safety mechanisms of last resort. If, for whatever reason, our brain feels the outside world is too scary, and we don't feel equipped to deal with it, it'll turn down the parts that make us feel good, and the parts that feel optimistic things will feel good if we do them. This lack of hope, and feelings of helplessness, make life feel flat and very exhausting, no matter how much we try and rest, the more exhausted we feel, and it becomes a vicious cycle.