That's great news indeed. The headache may be a symptom related to this so these may resolve when the other gets treated. As you react on one side and not so much on the other then this is a very good and positive test result. You should explain and reporduce this for your chiropractor. I would then perhaps see your GP and get referred to an ENT or specialist that deals in that area. As well as self treatment there are some meds that will assist if BPPV is the cause here.