I feel like I'm at my wits end. I've yet to sleep more than a couple of hours and this has been going on for weeks. 
My DD is nearly 21 weeks and is suffering really badly with gas at night. I can hear it bubbling round in her little belly. As a result she is thrashing around and crying in her sleep. The only thing that will soothe her is to pick her up and hold her at my shoulder. As soon as I put her down she starts her sleep crying. This now means I'm getting no sleep. She is very heavy and it's killing my back. She's a poor napper so I'm not getting a chance to sleep during the day. It's really getting me down. She's exclusively BF and I'm trying to burp her as best I can but clearly I'm doing something wrong