I am recovering from a cold that has lasted 5

Patient : I am recovering from a cold that has lasted 5 days so far. The third day into the cold, I started experiencing light-headedness and nasea. It didn't matter whether I was lying down or upright and it lasted all day. This has happened everyday since; it feels like I am in a dream. Concerned, I visited a GP who suggested I'm dehydrated and wanted me to up my fluids (to at least 4L per day). Is there a way of determining whether this is neurological? How many more days of this should I start to worry that this is serious?
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