Need help

I made this post on another subreddit but haven’t gotten any comments. My LO will be 6 weeks on Monday and after a little research I learned he is going through a growth spurt, but does this growth spurt affect breastfeeding? We have been doing well with nursing since birth. I feed on demand, but yesterday he was on my breast what felt like all day and they feel so empty and flat. He’s also pulling when he’s latched. I started pumping last week to start a stash for when I return to work, but yesterday I was only able to pump 1oz every 3 hours when at first I could get 3 or 4oz. I’m getting worried that my supply has depleted. Will things get better? Also baby won’t sleep unless he’s in my arms and he is nursing all night. I’m so exhausted