B.C.
My episiotomy wasn't nearly as bad as a tear (my son was just over 9 lbs) but my Dr advised frequent epsom salt sits bathes, witch hazel, ice packs and walking around (the walking was harder since my hips were still grinding badly for about 2 weeks after birth until my pelvis tightened up again).
You can't lay down all the time but laying down rather than sitting will be easier the first few weeks.