allergies or what?!

My 1 year old is suffering from runny nose, cough, and watery eyes for the last month. It goes on and off. Everything started when we switched to almond milk. ALSO coincide with weather change. Spring hit us very hard with pollen all over the place (I'm from NY). I got an air purifier. I also use an humidifier in her room at night. I've partially close the central air vent in her room and added a special filter for allergens. She coughs so bad at night. Idk what else to do. Should I test her for allergies? besides these symptoms there is nothing else. She eats, and is happy during the day.