any ideas why dd suddenly hates my right boob?

[deaconblue]

she's 14 weeks and has always fed happily from both sides. The right side used to let down too quickly and she got flooded but hasn't done that for ages so I don't think that's the problem. She feeds for about 1/2 her usual amount of time, then when the feeding would usually slow down to that slow half asleep occasional sucking she starts screeching, clamps onto my nipple and jerks her head back. Only on the right side. I thought it might be wind but even after burping she won't go back and finish her feed, just screeches again.
Any ideas please? Oh and she doesn't seem hungry afterwards ie waits her usual amount of time before wanting next feed

[FabioFridgeFluffFrenzy]

Try holding her rugby ball style, if you don't already.

[deaconblue]

have tried and it is slightly less screechy like that but still a bit weird. Do you think maybe she's uncomfortable on her left side then?