oh, I'm so sorry today was rough. At least your dh was able to take your toddler. Have you been nursing him to sleep regularly? Also, in terms of a wind down, he may need a bit more time to transition. So if he gets up at 7,(I don't know what time he gets up, just using that) feed him and have some low key A time then , at about 8:30 (no later than that, maybe earlier), head to his room. Change his diaper, swaddle him (I still swaddled my dd until she was over 4 mos old), close the blinds/curtains in his room, then you could sit and read to him and rock a bit. Have you tried pat/shh? I would start the shh/pat on your shoulder and keep doing it til he's calm (but not asleep), then take him to the crib and lay him down and keep doing the pat/shh til he's asleep. In the beginning, we would keep pat/shhing through the first 20 min sleep cycle just to make sure dd was good and asleep. It's really time consuming in the beginning, and depending on how your toddler does playing alone, you may not be able to do all the pat/shh, but if you at least start it with the wind down, that should help.
Hang in there, I know this stage is really tough.