So I tried the astragalus tincture from terra firma botanicals (http://www.terrafirmabotanicals.com/astragalus-tincture). I took 8 drops and after about an hour or two it increased my visual snow, tinnitus (which I rarely get), intrusive thoughts, intrusive images, and depression. I felt really cold and just generally bad until I took a nap. When I woke up from the nap my shirt was soaked in my sweat. I felt an increase in vitality and blood flow. Throughout the next couple of days I would either feel vitalized or weak and more depressed than usual. After 4 days I took 6 drops of a gingko, gotu kola, and rosemary tincture from the same site (http://www.terrafirmabotanicals.com/page_20_12/organic-brain-tonic). It made me feel sedated but the next day I felt great. Ever since that day I feel good and my vision has never been better (since onset of HPPD) - still not cured though. I'm not sure if that's the astragalus or the gotu kola or both or just time doing it's thing. I'm not sure if I'm going to take astragalus anymore though because I didn't like how it made me feel. It might be one of those suffer now to gain more later type of things though.