Poor you! I totally understand what you're going through. DS was colicky until he was about five months, at which point he became (and continues to be), the most good natured kid ever.
Sounds to me like you've already identified the tools with which to fight this i.e. feeding and a sling. I'm serious. Is your DC BFing? If so, it'll be a godsend. Take up residence in the living room with DVD box sets,'plenty to eat, a phone, and something to drink. If comfort sucking and being held is what comforts her, then so be it.
Overnights will no doubt be challenging. Co-sleeping or part co-sleeping will help you both. If you're not into this as an idea (I wasn't - I need my bed to myself to get a proper night's sleep), it absolutely doesn't mean your DD will be in with you until she's 5! Definitely got us through the first six months at which point DS became a 7 till 7 sleeper. Regardless, your DW will need your help overnight. Or she might just go mad! Bottle of infacol or colief might be useful.
Looking back on it, the worst thing about DS's colic was how much we worried about it. Is he feeding too much? Is he in pain? I should be able to put him down. Am I making a rod for my own back?! I really wish we'd saved our energy and just done what he was directing us to do which was hold him, and feed him. Eventually it all stops. And looking on the brightside, every seemed so much easier once it had stopped. Four years later my DH says that the demanding colic days gave him an opportunity to be a really 'equal' parent. It's really apparent to us how interchangeable we are as parents to both our kids. DH had no choice but to be very very hands on otherwise I would have never had any sleep and he was always better at settling than I was. We're still benefitting from this now.
This will be ok! Good luck or I'm serious about DVD boxsets! I was particularly fond of the West Wing.