Just started flossing, and my gums feel imflammed afterwards? How long till this goes away?

I'm 22 and just now starting to floss, and I just started tonight :) Now some of my gums feel inflamed, How long will I get this? and Should I gargle warm salt water? or Peroxide? I'm trying to get my teeth stronger and such, as I've been having an issue with a bruised tooth, and I am currently using Denta 5000 plus to help strengthen them (which after 20 days of using it, my teeth are starting to look a lot better, they don't look as mineral deficient like before, but I still have some gums starting to recede, so I'm trying to combat that right now. when I used the floss, I noticed a decent amount of food came out from my gum line. I sure do hope that, it will help slow or stop the progression on the gums receding, as I dont want to have fake teeth, expecly since I'm only 22, I'm still pretty young.