Believe it or not; there is no cure for common cold!
It all depends on your immune system. If you keep your immune system strong the common cold does not happen in the first place. However, if it does, our bodies fight it naturally. So, it's better to aid our bodies with natural remedies like ginger and chicken soup etc.
Thals. have a weaker immune system and fall sick pretty often. The best cure is prevention. Keep a healthy diet and lifestyle and the immune system gradually builds up. As for the blood counts; keep them in check too. Too low Hb. will put a stress on the body and compromise immunity. For Iron deficient Thal. Minors, intake of Iron rich diet will balance things out.