awww, I am sorry your first try didn't work for you Rainforest, but if it didn't feel right you did the right thing to give up and try again later.

did you put ds as far up to the head end as possible
Are you wrapping him, they do look small in them but usualy like the movment. Have you tried gently bouncing him.
exactly what I would suggest. I placed DD as far to the end as possible to keep her head elevated.

I didn't really use my hammock until 5 weeks. DD slept on the couch, in the pram (bassinet) and on my bed for naps and we co-slept in a single bed just DD and I for the first 5 weeks while we got used to each other and sleeping. At 5 weeks I moved back into the 'marital bed' and DD started the night in the hammock, moving into the bed and co-sleeping for the rest of the night when she woke for her first feed.

Definitely try again later when you feel better about it. It certainly wont be too late.