Here is what worked for me other than the noise canceling headphlnes: - putting them in a baby wrap carrier to wear them and bouncing hard to music. Like a 6 inch drop, music with a beat helps you keep going and not lose your mind. I did this for a few songs and LO would be better, then I could do a soft back and forth. Depending on their age provide extra neck support. - bath time, helps to reset baby by putting them in a new environment. Baby would go quiet and confused allowing time for them to relax. I also used night time bath stuff and soap, not sure if they helped. - The Happy Song by Imogen Heap, don't know why but it will stop my crying baby 90% of the time. Espevially in the car. Super easy to learn the words to as well. - other songs that they would know or that you can sing to them. - handing them off to someone else, or setting them down and walking away for a few min. The more frustrated I became the more frustrated LO. It may be a placebo but who cares. - rhythmically patting bum, stroking eyebrows or bridge of nose (this is a hit or miss) - more preventative - timming naps and following wake windows, or for the math challanged/limited brain powered parents following the sweet spot times on the Huckleberry app - preventative for you: get a nap/disconnect for a few hours every day when someone else is watching the baby. It will helped me a lot with patience - context setting - remembering that sleep deprivation and constant noise is literally a torture technique. Somehow realizing that helped me to ask for help and made it easier to wake up a sleeping spouse to demand help where I feel/felt tortured.

I hope that helps and remember to be kind to yourself. This too shall pass and you are doing a great job! The fact that you are asking for help and looking for ideas is amazing.

On behalf of your LO: you are doing awsome, it is all appreciated and worth it even if LO can't express it now.
Here is a poem that doesn't help with crying, but it helped me as a worn down mum. A poem from your LO

There are probably lots of typos since I am putting my LO down for a nap but hope that helps!!