What Causes Frequent Asthma Attacks With Vomiting And Lack Of Appetite?

Good day Doctors Please assist, my son turning 2 next month end has asthmatic symptoms, and is currently been treated with Aspelone and the Asthevent pump/inhaler, as they cannot fully diagnose him. It stops only for a few weeks and each time it comes back, it`s worse than before. He vomits and does not have an appetite at all. Whereas my 3 year old has runny nose all year round, and he too has no appetite. What can I get my boys, I am in desperate need of your expertise? Their immunizations are upto date and they are very healthy as per the milestones on the charts. May God richly bless yol*** Regards. Lebo