Oh poor you Hunter sorry you feel like this. I don't really have any words of wisdom other than that I wish people wouldn't say 'it gets better at about 6 weeks', as then you are almost expecting it to suddenly turn a corner, and it just doesn't work like that. Everybody said this to me, and then I was going round the bend at 7 weeks thinking I must be rubbish as it was no better (in fact felt worse as novelty had worn off, and exhaustion had properly set in).
Waking 3 times in the night to feed is not that unusual at 6 weeks, he's still tiny and will get hungry often. I know that doesn't help, because I know you want to know when it will get better and how, but the point is, it really does, just try not to count down to a specific age/date by which you think it will be better, because they're all different.
For us, I started to feel I had got to grips with things generally around 4 months, which to you will seem like ages away, but the point is that for you, it might be next week. Having said that, sleep and night feeds really improved way before that, at about 8 weeks.
Do you have an evening/bedtime routine yet? It is probably a good time to start thinking about one, it made a massive difference to us. We do small feed, bath, big feed, bed. The two feeds means that she tanks up well before bedtime. After that, I would just aim to do a really good feed as late as you can stand before you go to bed yourself.
Does he get wind badly? Wondering if that might be why he is screaming after a feed? Is he sick a lot? How/where are you doing night feeds?
Again, not a very helpful post exactly, as it is a hard time early on, and we all go through it, but it does get better, it really does, the only hard thing is that we can't really say when. Your DS just needs you and needs to feed regularly right now. It honestly won't last long.
D