Sleep Help!

Help! I can't get my little one to nap or sleep at night without being held, we can't put her down. She's 5 weeks old and out of desperation I have kicked my husband out of bed to co-sleep with her. She falls asleep in our arms just fine, but when we go to lie her down in her bouncer or bassinet she wakes up and throws a fit. I'm talking red in the face, not breathing, screaming, making herself spit up. Some advice on how to get her down without the fit would be great!