Hey dude, it may get worse before it gets better so don't panic too badly if it looks worse today, especially seeing as you probably haven't started any serious treatment of it. It may take some time to go away too...
I have a pretty fresh tragus punch and I basically just get a mug with my SSS mixture and tilt my head and dip the whole ear into the cup. then I kinda bring my head back up so it's at a bit of an angle so that the water tilts in and fills my ear a bit more and soaks the entire tragus, back and front. As for the camomile, you can either dunk the tea bag into your SSS and kill two birds with one stone or alternatively dunk it a few times in boiling water, allow it to cool a little and then use the teabag to press up against the bump.
As for the jewellery change, yeah, definitely needs to happen but I can't be sure whether you should change it now or after the bump reduces or starts to heal...seems it's kinda off from the piercing a little bit so I guess a jewellery change would be okay at the moment but I would probably get your piercer to do it or something rather than do it yourself in this situation. Maybe someone else has more complete advice on that part of your prob.
EDIT: And try to get a labret stud, not a barbell. Barbell can have as much movement as a bead ring, and I think that's what causes the bump...so try and get a relatively snug fitting labret stud with a ball to restrict movement.
Pierced, Punched, Stretched & Scalpelled
IAM: MrMeaner