I got horrid allergies this season! I use store-brand saline nasal spray to keep my sinuses hydrated (perfectly safe in pregnancy), a vaporizer in my room at night which helped, and this hot honey-lemon-water mix that seemed to work amazing. I boiled the honey and water together (to rid some of the natural sugars in the honey), then added the lemon, although I've heard it works just as well if you add both after.
I've never tried the apple cider vinegar + water, although my grandmother and mother both got real bad allergies while pregnant and would just take straight ACV.
I have heard that if you regularly eat some local honey that can help with hayfever - the tiny amount of pollen in the honey naturally desensitises you to the pollen that is in the air over time. Has to be local though as types of pollen vary from area to area
I haven't tried it myself but the theory sounds good at least
Don't know about prevention, but if you're having an outbreak of hayfever, you're meant to avoid citrus (other than lemons) and strawberries, as they can boost your overactive immune response. Local honey does help. Don't know about anyone else, but I've found that echinacea makes my allergy attacks worse (immune booster effect?).
Diphenhydramine (Benedryl) is meant to be safe in preganancy (class B) if you're having really bad outbreak. It's also used as a sleep aid, so it will make you drowsy. In my experience, it tends to loose it's effectiveness after a week of constant usage, so I save it for the very worst of allergy attacks.
local honey definately helps if it's hayfever, but you have to be quite strict about it and have it regularly, not just on the odd ocassion otherwise it won't do much.
in the height of the season I always make sure I keep the bedroom windows & doors shut, and don't go in there apart from at night, and shower right before going to bed - that helps a good night's sleep!
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