P.M.
If wearing my baby worked to help her sleep, I would do it, for at least a couple of hours morning and evening. That leaves hands free to get at least a few things done, and she'd be getting the sleep she needs to help regulate brain growth and development. It could also help to make napping a more habitual part of her day.
It's also important to know that some babies just can't wait 3 hours between feedings during their first 2-3 months. They can't hold enough at a feeding to tide them over for that long. She could be hungry.
I hear that you are feeling desperate, but 10 weeks is MUCH too young to use CIO. Even proponents of this method acknowledge that the extensive and repeated release of the stress hormones cortisol and adrenalin can damage the brain (it actually makes some brain structures smaller). Babies do eventually fall asleep from exhaustion, but that's not the same thing as connected, cuddly and safe napping.
Have you tried the Happiest Baby on the Block techniques as taught by Dr. Harvey Karp?
How-to's: http://www.youtube.com/watch?v=G6KnVPUdEgQ&feature=re...
Enhanced sleep: http://www.youtube.com/watch?v=Tk5MUOMecHI&NR=1