Unfortunately the recovery phase is NOT an easy one at first. Its full of ups and downs and a few setbacks thrown in there too. Hopefully your metallic taste phase will only be around for a short time, it should be only temporary. Most patients have a very thick ropey, gunky mucous towards the end of rads and the first couple weeks of recovery. I had that instead of tasting metal. Everything I ate tasted like it was over-salted and burnt. To me even bottled pure spring water tasted like it was loaded with salt and charred. That only stuck around as long as the thick gunky mucous then it was onto the dry mouth phase. The only thing I would suggest is using the magic mouthwash which you are already doing. You may need to take some nausea meds like zofran (prescription medicine) to help you get past the nausea the metallic taste brings.

Hang in there! You are almost past the worst of this experience.