That was me, curled my back once near the end of a set and couldn't walk without pain for about 2 weeks. Been scared to try deadlifts again since I know the pain.
Uggh I bought pea protein and couldn't use it. It was WAY to strong of a pea taste and I do like peas too. Wen't back to whey for when I don't get enough chicken, etc. in a day.