Airsickness (and motion sickness in general) does affect people to various extents.
Some outstanding pilots are motion-sick, so if you experience it - don't expect it to be the end of your flying career.
Personally, I seem to be a 'medium severity' case.
Would quickly get motion-sick reading in a coach (but not in an airliner).
My symptoms only show up in thermal flights with some turbulence. Before I've started flying inland, I've never suspected I'm airsick during few years of coastal ridge soaring. After 20-30 min of flight (without any treatment), I start to feel nauseous, up to vomiting mid-air.
All remedies fall into few broad categories :
chemical medications (off-the counter, e.g. Travacalm, and stronger prescription ones)
herbal medications (ginger)
exercises that induce motion sickness (e.g. on playground equipment on the ground, or wingovers/spirals in the air)
lifestyle (hydration, light food, more sleep, less alcohol)
Efficacy of all abovementioned means differs widely from one person to another, but it looks like herbal or off-the shelf medications would work for vast majority. Only one pilot (of dozen airsick ones I know) needs prescription drugs.
Pharmacy medications available in Australia are Kwells and Travacalm (Original in blue package and HO in red package). Both contain hyoscine (scopolamine) hydrobromide. Travacalm Original also contains dimenhydrinate and caffeine.
Despite the caffeine content, full Travacalm pill would make me a bit sleepy after its action is over, so be careful if driving evening after flying. Half pill is enough for me for 5+ hours (i.e. full day of thermic flying), but others need two pills.
Important factor is that Travacalm must be taken 30 min before the takeoff (e.g. after coming to launch, or before driving up launch) I.e it would prevent, but wouldn't cure the dizziness that has already started.
Scopolamine-only drugs (Kwells and Travacalm HO) are noticeably less efficient (for me).
Scopolamine is also sold as patches/plasters, that release it slowly and lasts for few days. Not sure if they are worthwhile to use.
Ginger alone (raw or in tablets, like Travacalm Natural in yellow package) doesn't work for anyone I know, but used as a component of many drugs, so worth trying.
One stronger prescription drug that has side effects (dizziness on the ground and sleepiness) might work (combined with scopolamine and ginger) is chlorphenamine.