Tiredness or resistance?

I have a tendency to push myself into exhaustion/burnout and I also have a tendency to avoid and escape. I am having a hard time knowing what is real. For example, this morning I started to embark on my scheduled day and I hit such a wall that felt like total exhaustion, like couldn’t focus, yawning, body ache and fatigue. I tried to continue on just to see if my energy would shift when I got involved in my work, but it didn’t. Do I just push through and plan for rest ahead of time or do I rest now? I exhaust myself just stressing out on what I’m supposed to be doing.