My son has periodic cough and breathing trouble from last one year

My 32 moths (2 yrs 8 month) son has problem of difficult breathing (breathing rate high around 60 breaths per minutes) with cough. He is fine right now but I am sending this detail for some resolution. Almost every month or may be twice in month (except may and june month this year) had this problem.
Problem details:
1. first he has sneezing and runny nose.
2. then yellowish discharge start from his nose with and without sneezing.
3. then he starts coughing.
4. then coughing rate will increase .
5. then he start coughing regularly and starts breathing trouble.
6. then rattling or whizzing sound will appear in his lungs.
7. after almost a week treatment he became ok.
8. and again this procedure will follow when next time he has runny nose and sneezing.
9. This problem is from almost last one year.
10. allopathic treatment ( nebulisation with levosulbutamol and budecort respules, some time antibiotic and decongestion syrups).
11. some time twice in last year he got admitted as well.
12. allopathic doctors are saying this is allergic asthma (seems like that) and main reason is cold. Because in may june when temperature was regularly above 40 Celsius he did not have any problem like that.
13. I know that his immune system is weak..
14. almost every time his blood and urine test is ok.
15. x ray report always say congestion (cough congestion) in lungs.
16. some time when he has rapid coughing he do vomiting as well. Vomiting comes with yellow cough discharge.
17. some time due to rapid coughing he has fever as well.
18. A small change in environment effects him with same problem.
19. little bit like 5 to 7 Celsius change in temperature effects him with sneezing and runny nose after same breathing trouble problem.

So please advice some thing.Do consider and anybody tell me that is it curable in homeopathy

Note: I also have cold allergy.
[message edited by raviranjan on Tue, 21 Aug 2012 09:28:16 BST]