My tips. Take ignore as you need. And sry if it's repetitive. I haven't read all the thread.
DH doesn't work 24/7. So neither should you. It's ok for you to ask him to help!
You mentioned LO sleeps in cot. Personally I would stick with this. DH and I were discouraged from many mummy friends who are currently struggling to get their LO in to their cot.
Get a slow cooker. Lol. I don't have one. But everyone on here raves about it.
Get DH to give last feed of evening. I.e. you give 9pm feed. And go to bed. Ask DH to give midnight feed. And then you do the rest of the night feeds. Obviously adjust timings according to your LO and DH bed time. Prob with this was I felt I was spending any time with DH. However I think it's worth it until your used to your routine.
LO has a nap at 12 every day at noon. I use this time to do chores. However at first use this time to catch up on sleep/rest/eat/watch trashy tv. I did this for 6 weeks!
(If you feel you must do house work) For those 6weeks I used LO short naps, 10min here n there , to do chores. You will be surprised how much You can do 10 min.
Take up offers of help. Take a shower when you have visitors. Get them to so washing. Although I wasn't comfortable asking all guests to do chores so often have them LO to hold while I went off and did a 10min Blitz on kitchen.
Most of all. Enjoy your LO. At 14weeks old I can't believe how quickly time flies! Congrats