I've been through this and sucked hard. Never will I use a decongestant nasal spray again.
If there was a way to somehow sum up all of the suffering caused by these sprays from dependency (which lasts weeks, months, years even) and compare that with the suffering alleviated from a cold (which lasts a fews days), my bet is these cause more harm than good.
Did you really develop such heavy dependence after using it a few days at a time? I don't get that at all.
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The best thing I ever did for decongestion was to get outside and start wearing a mask during the winter. The air entering my nose is clearer and warmer, which causes less mucus production. The mucus that is produced is more likely to drain, rather than sit around thickening and waiting to be blown out. I wish I'd thought to wear a mask while out when I was younger; could have saved myself much suffering waiting at the bus stop and during the subsequent schoolday.