Well, first off, figure out if the anxiety is deserved. Do you have some possible random costs coming up? Do you think you have enough emergency fund? Some people (me included) just feel like there's always some kind of terrible bad thing that I would never be able to plan for... and sure, that could happen, but it's unlikely.

Let's say that it's founded based on your budget. You can either up your income (work more, more clients, whatever), but I think the easier thing can be to be more frugal. Look at your expenses and see if there's anything you can lower. Eating out or delivery is a prime example of something you might be able to lessen.

Sometimes the act of saving money itself can be a good feeling to fight against the feeling that you don't have enough. At least it feels like you are doing something to fix the problem.