UFO Sighting in London, England

I was watching fireworks in my backyard at midnight on new years eve. i noticed some lights behaving very unlike traditional fireworks, so i started filming them on my phone. they were the bright orbs which cycle through the colour spectrum, zip about impossibly fast and often make triangles. they were travelling south across the city, but paused above the tooting/ mitcham area for several minutes, i think. my recollection of the conclusion of the sighting is very hazy, i think i might have filmed something happen to me at the very end of the clip. i noticed some time later that i have strange wounds (scoop on right hip) and implanted matter in my left hand with no visible entry site and magnetic properties.