Yep, that's been me for the past few years now. I was the same constantly going, going, going, but I became depressed while pregnant with my son, and then just fell apart after he was born and couldn't keep anything together. I believe that stemmed more from resurfacing childhood and early adult-era trauma than typical ppd. Then last summer I became completely paralyzed, I didn't make the connection, but looking back it was right around the time we discovered that he has a severe peanut allergy. I really thought my child was going to die. It was awful. And I feel like I've been in a state of suspended animation ever since. No energy, minimal feelings or emotions, brain just dead...
I started seeing a therapist and then I also started an antidepressant (bupropion) about 5 weeks ago. I also went to my doctor to see if something was physically wrong with me. She found a vitamin deficiency so I've been on prescription supplements, as well. Some combination of those things has helped significantly. I feel like I used to run at about 97%. I dropped down to something more like 2% and now I'm around 35%. 35 is great compared to 2, so I feel like a lot of progress has been made, but still it's nothing like 97.
I don't know if those things would help you, but I hope you find something that will.