There is currently some frontier research being done on BOL, or 2-Bromo LSD. In layman's terms (the only ones I know), they have attached a bromine atom to the LSD molecule which renders it non-hallucinogenic. The good part (for us) is that it seems to have the same therapeutic effect on CH. A test with 4 subjects was conducted last year in Germany with VERY promising results, and another study is in the works at Harvard's McLean Hospital, hopefully as early as 2010. What's really exciting, in my opinion, is that a non-hallucinogenic treatment has a much better chance of flying though the FDA approval process.
You can find more about it on this site, but I'm not sure which threads. Try the search function. I was fortunate enough to hear Dr. Halpern talk about it at the CB conference in Chicago this past September.