To Joe, 33 month old Child - Sever Itching. congestion and Breathing

Joe, I need your help. I read lot of article on abc forum and hoping you can give me some advice.

My son is 33 month old. After one month of birth he was having Eczema. After 6 months, we were asked to do blood test where he found allergic to Milk, Wheat and Soya. So, until now he is on breast milk. Since last winter he was having sever congestion problem started when we take him out during cold or weather change, which turn to Breathing problem and we need to give him Naboligation (XOPENEX) and after 2-3 doses he becomes ok. For the allergy doctor prescribed us ZYRTEC, initially which was given as necessary but since this Feb' when spring started he was having same issue and Doctor told us because of pollen allergy, he has this symptom. Since then every day we need to give him ZYRTEC which is preventing nasal congestion also. He has rashes on this whole body and he is doing lot of itching whole day, to prevent this we are applying Desowen, though initially it worked well but these days it is also not much effective.

Today we give ZYRTEC 5ml regular and applying Desowen on affected areas. I want your advice to find is their any treatment in Homeopathy where we can avoid give him ZYRTEC and Desowen in longer run.
Your guidance is appreciated.