That feeling led me to my adhd diagnosis because it wouldn’t go away on anti-depressants. Adderall has helped me so much with that. I was completely immobilized mentally and so tired! I still get that way sometimes, especially when I feel over-stimulated or miss a dose. I am on anti-anxiety meds and adderall now and feel like a human being again.
My doctor said that feeling of overwhelm to the point of paralysis is very common with adhd and so is tiredness.
Also, I have always struggled with feeling tired/anxious but had been able to cope until I started having kids and new mommy responsibilities.