I contracted measles a year ago, 20 yr old male, is a complication like sspe likely, given no past history of measles or vaccine?

Possibly: But not likely. Are you symptomatic? Subacute sclerosing panencephalitis (sspe) is a rare chronic, progressive encephalitis that affects children and young adults, by persistent infection with measles virus (which can be due to viral mutation). No cure is known, but it can be managed by medication if treatment is started early. See a neurologist.