My DS is 9 weeks old and his feeding has gone really weird in the last 3 days. I've been ebf him since getting home from hospital (started on formula primarily as in special care) and he's been gaining weight well and feeding well.
Having settled into something like one boob every 3 hours or so, he's been wanting both of them and at least every 3 hours if not more often since Saturday. Sometimes he'll only feed for a few minutes before yanking back, sucking just the nipple (OUCH!)
then crying and fussing. It feels very much like there isn't sufficient milk for him and he's most upset. Sometimes switching him to the opposite boob helps, and changing positions helped yesterday, but this evening it didn't matter which position he was in - he was distressed and coming off.
I wonder if it's a growth spurt but it also worries me that my milk is drying up? This evening he only sucked for 3 mins on the right boob before coming off and crying - when I tried expressing it a bit later there was virtually nothing there (and usually I express a bit each day so I have a few ebm bottles for when I want some extra sleep/to go out, so I know I CAN get a decent amount at the pump).
I wonder whether my expressing has contributed to this (only ever give DS one bottle per day of around 80 ml), and/or the fact that last week he started sleeping for a bit longer? He went for 5-6 hours straight rather than 3-4 which was wonderful for my sleep + sanity, but he's now back to 3-4 again. 
Any suggestions or reassurance would be welcome- very concerned he's going hungry!! 
I tried the helplines tonight but no luck and next local bf clinic is Friday...