Question about relapse...

I don't need any sort of pep-talk, because I already feel guilty enough. But...

Friday was day 18 for me. I felt almost completely normal! Except for the entire day, I was fantasizing about kratom. Due to the circumstances, I had a relapse that night and took about 5 grams, my typical dose when I was using 3x daily. In a way, I'm glad that this happened, because while I was on it I kept thinking to myself how I really wasn't enjoying the feeling at all and the entire next day I felt incredibly ashamed, to the extent that I doubt this will happen again.

My question is: how much have I fucked myself over by doing this? Yesterday my mood was really off and I suffered from a runny nose, just like acute w/d. It was not nearly as bad as the acute w/d from months of using, but it definitely returned. I feel a little off today too. Have I reset my withdrawal period, or is this just a temporary thing that will clear up in a few days? I'm asking for advice from people who have experienced something similar. I'm confident that this isn't going to happen again and I'm just trying to move on from it.