I'm sorry you're going through this. My middle sone was fussy and we used music and a hot water bottle (wrapped in a receiving blanket so it's warm, not hot) beside him in his bassinette and it did the trick. But he liked contact, so I'm not sure if that would work. Might, the warmth might be comforting.

It will get easier. I know that probably means literally nothing right now, but it does. Cut yourself some slack.

Also, just a thought, my oldest was fussy and it turned out he had a milk allergy and as such was allergic to the formula I was giving him. I'm not sure what you're feeding the baby (breast or formula), but if he's on formula and is really THAT fussy, a chat with your doctor might be something you may want to consider.