Did I take on too much work?

I keep getting clients. I have a booming business. I do not have the time to do the work though. I’m failing my clients, my family and myself. I want to keep earning all the $ to payoff debt and purchase our second home. I feel an extreme pressure to do this. Here’s my model. We have a finite amount of time how can I choose when to stop taking on more work.
C Work
T I have too much work and not enough time to get it done.
F Overwhelmed
A Buffer w planning, jumping around, clean house, eat, cry journal
R Complete Client work and loads of $

C Work
T I will get all the work done. I just don’t when it will all be done.
F Accomplished
A Do one task at a time.
R One task done at a time