I had never in my life had allergies. Then we moved 12 years ago and it has completely changed my life. I kept saying for two years "I don't have allergies!" However, my doctor informed me that I live an area that has the most allergists per capita in the US. He also told me (get this!) the older one gets, the more things we become allergic to. Oh ugh!
Anyway, sure hope yours is just a cold and nothing worse, and that you get to feeling much better soon.
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If you can't sleep, then get up and do something instead of lying there worrying. It's the worry that gets you, not the lack of sleep.
-Dale Carnegie