Remedy for colds, anyone?

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I took Decolgen yesterday after lunch and it made me snoozing the most of the afternoon. Last night I drank a glass of hot calamansi juice and took another pill, and took the night-in without turning on the airconditioner. I just left it on the "fan" mode. I woke up not feeling well this morning. My nose is clogged. I feel uneasy. And I think my throat is itchy. I already ate my breakfast so I can take my medicine. Again, I drank a lot of juice. Aside from taking pills, what are your suggestions and full-proof remedy for colds?