Firstly, the sore nipples: are you using proper lansinoh? It really is the best stuff, most midwives/health visitors have sachets they can give you for free. Lansinoh works by wet healing, you just shove a load on religiously after every feed. They'll probably toughen up all of a sudden, I know it sounds silly but try doing your labour breathing while he latches on, I remember how excruciating the first few seconds were.
My baby had jaundice for the first month, in the end he had to go in for lightbox treatment on day 9, for nearly three days. They were thinking about doing more treatment on him when it finally went, but I did end up giving him topups because I wanted the jaundice gone asap. A lady on the LaLecheleague helpline said that it was actually the fat in the milk not the fluids themselves which helped shift the jaundice iirc, so it's the hindmilk he needed.
He didn't have a tonguetie but when I got my latch checked they told me he had only been getting the foremilk because everytime he closed his eyes I was taking him off the boob thinking he was finished Once I realised he was still feeding he started to put on weight rapdily but of course by then I had come to rely on the topups. It was a shame really.
Don't concentrate on how full your breasts feel, they won't always feel fit to burst even when you're producing more than ample for your baby's needs. And don't pay too much attention to how much you can express either. Breastpumps simply aren't as good as babies at collecting all the milk.
As somebody else said, just feed feed feed. The first few weeks of establishing bf are hell imho, sitting on the sofa almost 24/7, it's sore and boring and frustrating but if you accept that it's like that for most women you stop feeing like it's going "wrong" so much! Just remember to drink enough fluids, oats help increase supply so porridge etc is good, get LOTS of rest (you make the most milk when you're asleep) and get as much help as you can, get your meals and drinks brought to you even. Ask your other half to remind you to eat, drink and rest.
Hope the tonguetie snip goes ok.