Mush brain

Hi all. I'm 4 months postpartum and struggling. I used to be so sharp, on top of everything with a great memory. Now I feel like I can't remember anything. I can't plan properly and am late to things all the time. Words don't come to me. I was a week late on my morgage because I simply forgot. The holidays were an absolute wreck. In large family gatherings I feel like can't focus on one conversation for more than like 30 seconds. I feel like I am just flitting around everywhere and a week behind on everything. And my husband is useless at stepping in to help direct things. I feel like the wheels are falling off the wagon. Is this my new normal brain or does it get better? I am so frustrated with myself.