Tstsen, actually you are at a great situation if you manage it right. You are clearly tired. Your own body is telling you something. As I understand you have your own business and you have too much to do. It is great! It means that you have more clients than you can cope with.
Demand is greater than supply. And what economists say about it? The price should go up!
It may need some planning (and a sabbatical before that), but it should decrease the level of stress. Increase your rates. Some of the clients will leave, but if the new price is chosen correctly, you will be getting at least the same money for the smaller amount of work. Or, you can think about hiring someone (or more people, if you already have staff).
I think it's the point of a big decision. Your business is outgrowing your abilities. You can either scale back, or you can go ahead and help it grow even more. It is likely that you will eventually stop being a designer, but turn into a manager. I guess it is the price to pay for having a successful business.
Of course, take my analysis with a grain (with a pile actually) of salt, since I don't have my own business yet. Still, I've seen this problem in different settings. The common sense tells us that there is a limit to our productivity and at some point we need a system that will help us do more.
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