Switching to the shot

So I’ve been on the pill since March of last year and it’s been great so far. When I first started taking it, I bled for about a month but other than that, I didn’t experience any symptoms. About halfway through my prescription, the doctor changed the brand and I started to experience nausea for about a week. I had some mood changes but nothing too drastic. I’m on my last pack now and I’m thinking of switching to the shot. Has anyone done this? What kind of symptoms did you experience? The thing I’m most concerned about is whether I will experience bleeding again or extreme mood swings.