If your body gives you signals it is at or over capacity it is generally a good idea to listen.
I was in a similar situation in April 2020, I first thought I could get by by reducing client projects to just one so I could "power through" the summer. Using weed after hard days to stop my head from spinning so I could sleep. The result was that by September I was in a way worse situation than April. I took a break for 6 months, just started working part-time again a few weeks ago and I'm still struggling to adapt.
Playing through the pain is fine for short bursts. But a human body and mind has limits and can only be pushed so far. I'm always happy to talk for 30-60 minutes in a video call about these kinds of issues if you want to. (I know being able to talk to others with similar issues was really helpful to me)