....picking myself up off the floor after reading about insurance company calling to "help" patient!
Before you decide NOT to try again that which makes you "ill" or hard to do, I encourage you to get out there over and over as first time for all vestibular challenges is the worst. Second time not so bad, try not to let your thoughts fool you into a fearful state. Also, while walking outside, do not keep your head down--look straight ahead, do not hold your head steady--relax your head/neck while walking. Yes, this will make you feel ill and uncomfortable BUT you are re-training your brain and you don't want to train it the wrong way. Take your cane with you, but carry it instead of relying on it. You can rely on it to get you back home safely.
At PT I did some of the uphill/downhill head turning stuff, you might want to use your driveway to go up and down while turning your head to L and center quickly, then turn around to repeat on L side. Then, repeat looking quickly to R side, back to center, up and down driveway. Keep doing this for one full minute, go inside, close your eyes and rest.
Cheering you on to a more balanced life!