i understand your concern.
yes you have to consult doctor
for detail evaluation of lump.
Lump near to auditory canal can give such symptoms like nausea/dizziness/headache.
Proper examination of lump is necessary.Consult ENT specialist
and he will guide you further.
Symptomatic treatment like analgesics and anti emetic medicines can helpful but do consultation before taking any medicines.
Proper treatment will possible after diagnosis .
still have query then feel free to ask.
get well soon.