DS had a growth spurt last week at 6 weeks and it lasted 3 days - constant feeding and very little sleep. I was almost out of my mind by the end of it. The next night he slept 6 hours straight (for the first time ever, but hasn't again since!) so I had a bit of a chance to rest and sleep.
It shouldn't be too much longer. Hang in there, and try and feed and rest in bed at the same time if you can.