I had a very difficult baby! The swing worked wonders but unfortunately not til bub was about 12 weeks.
My dd's OT and psych told me that the swing going in a linear direction (front to back) has proven to help promote sleep and help reflux. My dd slept a lot on the swing. I would try persevering. Funnily enough my dd liked it side to side.
Also I found that at around 9 weeks onwards my baby didn't want to sleep for long periods and that was making her even worse. I had a sleep lady come and she helped me immensely with settling her and keeping her soothed. I used a dummy too.
Does bub like the pram at all? I tried that at home. .. put bub in pram and rock or jiggle it till she fell asleep.
Plus white noise. I had a little giraffe and sheep that plays nature noises like the ocean or rain. At 21 months she's still falling asleep to it.
Hugs. I hope you can find something that works.
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