@astrid I was having a similar issue. We were both miserable until my milk came in around day 5-6. He was constantly hungry, which made him especially fussy and difficult to feed.
The LC at our peds office was a big help in calming me down. Keep in mind this is temporary, and things should get better once your milk comes in. In the interim, she had me pump in between some feedings to help with my supply and drink 3-4 cups of mothers tea a day. I picked up the Yogi or Yoga brand from my local supermarket. I also used a hearing pad on my chest for 10 minutes or so throughout the day.
The LC was a big help. I plan reaching out to one tomorrow for some help with some new issues we're having.
Breastfeeding is hard! For me, it's been harder than pregnancy. I hope things get better for you quickly.