In my opinion and with the background details, I feel your treating physician has correctly diagnosed it as a probable anaphylactoid reaction to Naproxen (aleva).
Naproxen, being a NSAID, has the following main side effects( with their occurrence rate)
Cardiovascular: Edema (3% to 9%), palpitations (
Central nervous system:
Dizziness (≤9%),
drowsiness (3% to 9%), headache (3% to 9%), vertigo (
Dermatologic: Pruritus (3% to 9%), skin rash (3% to 9%), ecchymoses (3% to 9%),
diaphoresis (
Endocrine & metabolic: Fluid retention (3% to 9%), increased thirst (
Gastrointestinal:
Abdominal pain (3% to 9%),
constipation (3% to 9%), nausea (3% to 9%), heartburn (3% to 9%), diarrhea (
Hematologic & oncologic: Hemolysis (3% to 9%), purpura (
Hepatic: Increased liver enzymes
Ophthalmic: Visual disturbance (
Otic: Tinnitus (3% to 9%), auditory disturbance (
Renal: Renal function abnormality
Respiratory: Dyspnea (3% to 9%)
Thanks