I'm worried because my nose is all runny. (only on the left side.) is is an allergic reaction, what do you suggest?

Tough to know: One sided runny nose from allergy is uncommon. Suggesting measures to obtain relief cannot be accomplished without more medical history, unfortunately. Consider a virtual consult with Health Tap Prime or discuss further with your primary physician. History of nose trauma/surgery, allergies, infections will be important for the conversation.