Could an allergy to aspartame cause shortness of breath or a feeling that i cannot take a deep breath? very annoying feeling

ALLERGIC RX: Yes aspartame can cause an allergic reaction /cough/sob. To confirm diagnosis see an allergist for testing

Unlikely: Aspartame has been implicated as a potential cause for otherwise unexplained and repeating severe anaphylactic reactions. Some patients swear it is a trigger. In small controlled studies, however, a link between aspartame and allergic sensitivity has not been established. I would work harder to identify alternative potential triggers. I would still avoid aspartame due to link with migraines, etc.