curious about splits

My septum is at a 8g rn i think but I've started to get scared about if it splits. Just in case, how could i avoid a split (i follow the stretching guide on here with a calendar and if its too uncomfortable to stretch i double the time)? also, if it does split, i saw you could get it stitched up and then continue(?) and was wondering where i would go for this (like just any doctor?) and how long before i could repierce it?