Hi,
Welcome to the forum. I am really glad to help you out. I can understand the pain and agony which you're going through. It makes sense to consult a cosmetologist/plastic surgeon and seek an opinion for the remedy.
I am sure there must be some surgical way to reduce the size of the lips. Unfortunately, there are no medications to cure the same. However, you should not be too conscious about the same.
I must tell you that people are more influenced by your inner qualities than by your external looks. Being a good human being is much more important than being a beautiful human being. I sincerely hope this information helps. Take care.