Strep 2zpacks, Bactrim allergic reaction. No more sore throat but earache and headache should I be concerned? No fever/stiff neck. Is it meningitis?

Meningitis. Absence of stiff neck and fever is reassuring. Earache could be a middle ear infection. Severe,persistent headache and ear ache warrants an examination by a physician.
Not meningitis. Strep rarely leads to meningitis, and if your well enough to be online asking this question, for sure you do not have it. You can also be sure your strep throat has been cured: azithromycin (Z-pack) is close to 100% reliable. Probably this was only a viral infection, or viral plus strep (if strep test was positive), with virus symptoms persisting. Antibiotics never work against viral illness.