Suggest Treatment For Profuse Sweating In Armpits

I'm an 18 year old male, 5'9", 160lbs, athletic build. Recently (starting several months ago) I began sweat excessively from my underarms and nowhere else. It usually occurs in the morning, if i get up early, and continues throughout the day, getting worse directly after lunch. I am a vegetarian and have been for a year now, but I don't think my diet is the problem. I don't feel particularly anxious before it happens either. I've tried heavy strength antiperspirants but they don't work. How could I prevent this annoying sweating?