Was it a nasal irrigator aka nasal douche? They can be kinda forceful depending how hard you squeeze the bottle which can be uncomfortable if you aren't relaxed.
When I had really bad allergies from pollen a week ago I tried a device that's like a Neti pot to clear out your sinuses and I didn't like how it made me feel like being waterboarded.I'll just stick to using saline spray.
it shouldn't be going down your throat much at all really. maybe the occasional trickle that sneaks in there but to say it feels like being waterboarded is a huge stretch.
it goes in one nostril and directly out the other if you tilt your head correctly and don't have a more serious issue like a deviated septum or something
There is some evidence that doing sinus rinses too frequently can irritate the nasal muscosa and actually cause sinusitis, so it's important that you only do a sinus rinse to remove an actual pathogen, like infected material, allergens, etc. Once your nose starts to recover, stop rinsing.
I've been told the same thing by a pharmacist but if my allergies are really bad I'll do it in the morning, at lunch time, and again before bed. Never had it do anything but help.
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I highly recommend you research medicinal mushrooms. My own immune system was hyperactive a year ago and I started to have permanent hay fever. When I tried a blend of medicinal mushroom extracts, about two weeks later the crazy allergies stop.
I can't guarantee anything but that was the most effective medicine for allergies ever, and I've been a lifetime sufferer. If you use pubmed and professional herbalist websites, you can learn a lot about mushrooms as immune modulants.