Can’t sleep 😭😭

Mostly in the day, I try to catch up on sleep since my daughter is still waking in the night of course. But I literally cannot fall asleep. Idk if it’s all my anxiety or PPD or insomnia or what but I try and try and can’t nap. My husband (we’re separated- long story but he’s been unfaithful a lot of times) comes over and watches the kids (we also have a 20 month old son) while I try to nap and I just can’t. 😭 I’m struggling so bad trying to survive on little sleep. Maybe I should talk to my doctor idk but I’m so so tired of not being able to sleep. Anyone with the same problem??