Thank You. I Was Dining Outside Tuesday Evening And Must

Thank you. I was dining outside Tuesday evening and must have gotten some kind of insect bite on the top portion of my left foot. Wednesday a.m. I noticed swelling and redness upon waking up. Now, my foot is terribly swollen and extremely painful. I took a Benadryl 45 minutes ago but symptoms haven't changed or lessened. Walking has become very difficult. Help!