Diamox isn't a HAPE drug, try Nifedipine, oxygen, descent, Gamow bag, etc. 
  
Gingko - garbage, but a great product for snake oil salesmen, look here -  http://nccam.nih.gov/health/ginkgo/ (a generically good site for real data on alternative medicine) 
  
Diamox- helped me tremendously when it came to being able to sleep above 15k, the tingling and carbonation side effects were well worth it. 
  
+1 on the taking longer to go higher suggestion, if you get sick your trip is probably over.