I have an herb garden with both culinary and medicinal herbs. one remedy stands out. Horehound - for sore throats and colds. You can still find horehound coughdrops for sale if you look hard enough. So I grew some just to try. Got a cold so I brew up some horehound tea. Take a swallow and almost gag. My Lord that stuff is bitter and nasty. Add some honey - still yuck. Dump some out and dilute with more water. Still gross. I can say it did offer relief to my sore throat. But it was so gross tasting I never made another cup of horehound tea. Ripped it outta the garden in fact to make room for some other herb.
As kids my father gave us candied ginger root for nausea or car-sickness. Worked very well. But I can't grow ginger here in NH.
Aloe plant for burns. Wet tea bags acts as a chelating agent and will stop a cut from bleeding. Pepperment tea for stomach upset.
I have a shelf full of books devoted to herbs but the above ones are the only ones I routinely use.
Phil