We've all been you are! This is what babies do, it's completely normal and necessary and how they get your supply up to meet their needs. You're not doing anything wrong, don't try to fix it or overthink it, just switch sides occasionally.
I remember going out of my mind in the 3rd or 4th night with dc1 when she fed almost continuously for 15 hours - we noted each start and stop and boob switch and nappy change in a notebook and went nearly mad fretting. The mw that arrived in the morning just nodded and said, 'ahhh the night of the long suck, she'll have a snooze soon' and tucked us back into bed. Just hearing that other people had been there before us helped.
Try to go with it, stay in bed or in the sofa, have good and drunk brought to you, watch a box set, listen to a podcast and snooze and let yourself be looked after - you're doing a job, a really important, time consuming and exhausting job and can't do anything else.
The more contact they have with your breast and the more time they spend stimulating your milk now, the more capacity you will develop to respond to future growth spurts. You're investing in the months ahead, you're front loading the work.
Stick with it, it gets better though it's a hell of a climb up this mountain, the view at the top is more than worth it. It's such hard work and feels so unfair after the hard work of pregnancy and labour, but it does get better, promise.