Breathless with chest infection, can i have my brown inhaler again after already using it a few hours before which helped or do i use my blue?

Use the brown again: The brown inhaler is a dilator of the lung passageways. You can use it multiple times if it helps and the relief with this is usually very rapid. The blue is a steroid which can quiet down lung passageway irritation but that takes time. If you have chest infection, it is best to not use steroids for a while while the antibiotics that I assume you are taking eliminates the infection.