Most of your symptoms do sound like a common cold. The swelling, if near your underam as you say, could be from an inflammed/blocked lymph gland - although with an upper respiratory infection, it is more commonly the lymph...
How is your rash now? Try a medically tested moisturiser or aloe vera gel when you get them. Moisturisation can prevent and reduce flare ups.
I am testing Marvin’s theory on my itching problem. I hope it is something else. After two... days, though, and no itching, we’ll see.
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I am testing Marvin’s theory on my itching...