HELLO and welcome to HCM forum,
i am glad you wrote in, i would like to inform you that ear infection
and swollen gums
are inter-related, this condition is called, 'pericoronitis'.
the gum around your wisdom tooth might be swollen, which causes a radiating pain
to the ear also,
the metallic taste
is either due to the medication or due to pus(infection) associated with the wisdom tooth.
i advise warm saline rinses(3-4 times/day),
antibacterial mouth rinse(twice/day) , and visit you dentist
soon, as he/she might click an x-ray to make sure your wisdom tooth is erupting in the right direction,
i hope i answered your query,
i wish you good health,