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I have gone through your question and I can understand your concern about your toothache and facial swelling. You need IV (intravenous) route antibiotics like Ceftriaxone one gram after allergic test and for that, you must visit either a dentist or an emergency room. After your infection is over either get your teeth root canaled or extracted as per the condition of the tooth and your choice.
The Probable causes:
Grossly decayed tooth.Differential diagnosis:
Periapical periodontal abscess with related space infection.Treatment plan:
IV route antibiotics after test dose for allergic reaction.
Root canal treatment or extraction.