I get the feeling that milk is the cause of my breathlessness and my coughing up mucous. I have Hay fever and am allergic to certain types of food for quite some time now and have been taking different anti allergic drugs for it, but have not seen a great difference because of it. So you can well imagine how horrified I was when I learnt that all the antihistamines that I have been taking so far were ones containing Lactose!! I have heard about Lactose, but never dreamt that it would be use in pills just to increase it size. And I am unable to find any antihistamines that do not have Lactose in them.