Headaches for a day or so after for me but otherwise fine. If you are still getting headaches and dizziness even at sea level then I would suggest going to see your sympathetic local GP, who could if need be refer you to a neurologist. Although neurology outpatient appointments take about a year to come through in most places.... Long term problems after HACE are not common, there is some evidence of long term cerebral damage after trips beyond 6000m and particularly beyond 8000m - which is a bit of a worry! - but the evidence is scant and tends to involve clumsiness, difficulty with words etc. How high were you when you got HACE? If you ran into trouble for a prolonged period at extreme altitude and had a slow difficult evacuation then it is feasible that some long term damage may have been done, but this is still unlikely. It's sudden brain swelling (cerebral oedema) that is due to the lack of oxygen and low atmospheric pressure that is the cause; when the oxygen availabilty and atmospheric pressure go up - by descending - the stimulus is removed and the oedema settles fairly rapidly. Interestingly a field study demonstrated the marked effectiveness of Egb761 (ginko biloba; 160mg twice a day) in preventing AMS. In a study of 44 trekkers in Nepal at altitudes up to 5400m, Roncin reported that none of the Egb761-treated subjects developed AMS, compared with 41% in the placebo-treated group (P<0.001) (Roncin et al., 1996). If these findings are confirmed, Egb761 will easily be the most potent known prophylaxis for AMS, but we don't have a clue why it works. Hope this is helpful, and that you are feeling better. From my experience the whole HACE thing leaves you quite rattled and wary about altitude far in excess of the short lived symptoms on the hill.