Chaga. You can toss a 2cm (about 1 inch or so) chunk into the teapot and refill the kettle 4 or 5 times before the chunk is depleted. Or, take it out and let it dry. Toss it back in for a new brew later on. I prefer to grind it up into powder and add it to my coffee grounds.
Rasberry and grape leaves make a pretty good tea as well. Mullen and chamomile are great too.
It'll probably end up hurting me in the long run, but when I do night shifts, I tend to bring an energy drink. However, I usually pick the ones with no fizz if possible, as well as low or no sugar and low-calorie. The latest one I took was a Monster that was made of white tea and dragonfruit extract.
Hmm not sure allergy. It is possible since I have a lot those.
It is more of eating a whole case of jars when I was 5 since I was starving. No one would me food so I found some and way over ate it to the point I was sick. I tried a taste years later and still get that sick feeling.
Ah, so not allergy - your body remembers what it went through once it senses that specific flavor. It's a form of physical trauma, and not an easy one to overcome, either.
I have the same issue with fish, especially salmon - I got very sick eating salmon fish sticks, so whenever I smell it I get that iron ball sensation in my stomach.
But yeah, if you don't mind losing the health benefits, try a little agave nectar with one cup of hot tea. It does a better job removing that sour taste in your mouth after a viral infection like the common cold. It's safer for diabetics, too.