Today was tons better already, Katherine! Sticking to your advice here

Falling asleep at night however was a challenge. Do you have any suggestions as to why that could have been? Here's today's EASY:
E: 4am (night waking)
S: 5-6am
E: 7:45am
S: 8:50-9:50 (took him 30-40 minutes to fall asleep)
E: 11:20am
S: 12:15-2pm (took him 30-40 minutes to fall asleep)
E: 3:10
S: 4:30 - 4:55 (took him 30-40 minutes to fall asleep)
E: 6:20
S: 8:10pm (took him an hour and 15 min to fall asleep!! I did not feel like I could stop and try again later, since it was already quite late at night. 90% of the time, DS was fussing, but not full blown crying, so initially I left him there. But after 20, 30, 40, 60 minutes, I did pick him up as it did not seem like he was about to settle any time soon. The last 10-15 min he was finally not fussing, but it still took him a while to finally sleep. He would open his eyes every so often... unable to sleep.)
To make matters worse, DH is super supportive and wants to help, but it seems that I am the only one craving that help as DS wants none of it . DH can calm DS by holding and rocking him, but the second he places him back on the crib, DS will cry like there’s no tomorrow… every time. So I’m kind of left alone to do it all.
Ideas, please?
Question from your previous post: When we talk about 2:30 min A Time, should I plan to get LO in the crib after 2 hours, anticipating a 30 min window for him to fall asleep?
Another question: When you say A time should not be less than 2 hours unless he had a super short nap, what would be a super short nap?
Thanks as always!!