Once again, both true and false : ephedrine, legal in the US last time I've checked, may have severe side effect, way worst than your small flu. Antibiotic induce germ resistance. A root may be better for your cold than antibiotics and ephedrine because a) you don't suffer the side effect of ephedrine b) cold is caused by a virus, the antibiotic won't have any effect anyway. Even if the root is useless.
Placebo effect is potent and may be all you need.
However Ephedrine will get you back on your feet so it may be useful.
An antibiotic will do
nothing for your cold, because colds are viral. You're very right that they're overused, though; doctors will often prescribe them when unnecessary, even if it's just to satisfy the patient, and antibiotic soaps/detergents are
very rarely justified in the home.
Pseudoephedrine (the decongestant) messes me up, for what it's worth. Makes me unable to sleep and anxious. Weird. Unfortunately, no other oral decongestant I've tried actually works very well (although nasal sprays do).
Regarding ginger, I've found ginger tea to be pretty decent at quelling nausea. I know people use ginger ale for that too, so there's some consistency there. I've used saltwater for a sore throat before, and that can work (it's a good debriding agent).
GMO plants don't bother me much, I haven't had any yet though because nobody dares sell them... as far as I know. Last time I checked, GMO plants aren't that different from normal ones, except for a different gene or two. So what if evolution is supposed to do the same thing but take longer, we can get a far more exact result with much less time. After all, the difference of a GMO and a normal organism is a few genes (genes in their proper places of course).
A few genes can be very, very important. Also, it's not guaranteed to give the "exact same result" as evolution because you're not breeding it within the ecosystem to begin with; you're making arbitrary changes that you
hope will work once introduced.