Breastfeeding problems again

Jack lost 140 grams between fortnightly weigh-ins last Tuesday. I've been pretty stressed and frazzled trying to ensure he's feeding enough since then. I just don't know what's wrong, and he's crying and screaming and carrying on during feeds. WE think he might be teething (already??) so have used a tiny bit of bonjella occasionally when he's really screaming the house down, and it seems to help. This is just so frustrating! He feeds fine during the night. During the day however... sometimes he's fine, sometimes he sucks for 2 minutes and then starts crying and sometimes screaming, and it's a complete guess as to what's wrong. We're burping him often, and sometimes that helps.

I'm just worried that he is still losing weight and I don't know what else to do. And I bet that if I feed in front of someone who could help, it will be a perfect feed. *sigh* He still has rolls and is a little chubby, so I'm not worried he's starving to death yet. He's very gorgeous and talks to people and laughs and grins and smiles. He has two cute dimples and blue eyes.

All the positions we used to use are no longer favoured. I can go through up to six positions (three for each side) before we either find something that 'works' or that we stop and have a break because his screaming is stressing me out. I locked Vinnie into his room for ten minutes the other day so I could get Jack to calm down and feed, and of course he did so and then went to sleep. Once I get Jack to sleep  he often doesn't stay asleep! It's always a tossup when he's screaming as to whether he needs a burp or sleep. When he sleeps I worry he should have fed more, and when he needs to burp I never seem to be able to do it properly.

It's been about four hours since I last bonjellad him and he's having problems sleeping again.
:-(

!!

Since my last moan, we've had two pretty good feeds.
I don't know whether to laugh or sigh.
:-)