Anxiety is caused by excessive thinking. Of course if you could just switch off constant worrying you'd have already done so.

Do you have any hobbies that you used to enjoy? Getting into them can be helpful, even if you don't enjoy as much as you used to it does provide a distraction. Much easier not to think excessively is to get into doing something else so mind has something to focus on.

Of course if you're depressed doing stuff is much harder. Hang in there and hopefully things will be better!