Looking for experiences with biologics

My rheum has been prompting me to start a biologic for the last several years. The doctor believes that Cosentyx is the best option for me. Flare ups are more common recently, and I'm currently is the midst of a flare and supporting symptoms with a steroid. I am able to work, but after managing pain and discomfort throughout the day, I am so exhausted, yet so uncomfortable because I am also not sleeping well. I have severe seasonal and environmental allergies that often lead to asthma and upper respiratory issues. I'm worried that taking a biologic may worsen this and make me more susceptible to congestion caused by allergies and illness. I'm a teacher, so I'm exposed to germs constantly. Anyone with similar allergy history or occupation have successful experience with Cosentyx or other biologic?