We are in the same boat with a 9 week old. She is fussy all days most days and won't stay asleep. In our case, even the swing isn't helping in the long term.
My DH has taken the brunt of the fussiness lately and it's wearing on him. Our DD is often hungry any more and might be at a growth spurt. We aren't sure.
DH will keep her in the swing and sit with her most of the night, then when he is beyond exhausted he will lay her, asleep, in her crib. Within 15 minutes she is awake and crying. At this point I go get her, sit in her dark room (with nightlight) in the rocker chair, swaddle her good, give her a little warm milk or until she stops sucking, keep the pacifier close just in case, and rock her to at least almost asleep and hold her close gently.
I have stages of setting her in the crib. I will slowly stop rocking, shift forward, stand up and rock her a little while making sure her eyes stay drowsy or closed, and then shift my hand behind her head and rock her a bit, then gently set her down butt first with hand underneath her, hold her there, then set down her head, hold her there and gently release both hands separately. If she starts thrashing around I will also put my hands softly upon her chest and legs just to comfort her. I stand for a few moments near the crib just in case she starts thrashing and I will softly place my hands on her again. If she wakes herself up, I repeat from the beginning. Usually she only takes her pacifier after having eaten already. It took me one early morning an hour and a half to settle her.
I'm thinking we might just start settling her down earlier in her crib. I dunno. Our living room is downstairs from our nursery and I go to bed before DH and he says he has a difficult time hearing her (I do NOT, it's not a large house at all).
She has been refusing to nap for long during the day and that leads to her just crying and crying. I hold her close and shhh her and use the pacifier, and she will go to sleep in my arms and sleep well but when we set her down she will wake up kind of quick and pretty unhappy. Just last week she loved her swing and slept well a few days off and on all day. Then we did sleep and naps in the car seats. It used to be her bouncie chair she loved for naps. She usually has success in the baby carrier, but DH doesn't wear it (yet).
It's all so trial and error! Both DH and I are beyond ourselves most days. It's difficult, but she is so beautiful. I understand your pain and I don't want to. Maybe if we find solutions every day we chould share ideas?