Frequent Cough and Cold in My Kids - #46360

My kids 8 year and 13 year old get cough cold frequently means almost every time. I have to keep giving them anti allergic medication most of the time and as I stop these within 2 to 3 days symptoms worsens and I have to give more and more medicines.Then younger one get fever also. Same repeated cycle every 15 days. I am fully burnt out. They have everything adenoids, sinusitis, nose block, bronchitis everything possible in respiratory allergies. Every time they have cold then cough also starts and don't go without medicines. I have to nebulize them or else it won't go easily.pleasr recommend sth. which Ican give them on daily basis so that their condition gets better. Also too many herbal medicines cause heat in their stomach and it causes digestive problem so don't know what to do.Should I try sitopaladi churna or himalaya septilin or what else. Please suggest.i need some solution not just discussion of the problem.