How to treat a 5 month old's cough and cold?

My 5mth old DS has a cold -coughing, sneezing, runny nose. We're snowed in so can't get to Dr. Are there any home remedies to treat this, or over the counter medicines I can give him? I've tried Calpol but it doesn't seem to do any good. Also his cough keeps waking him up at night, what can I do to help this?
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