DHE can be very helpful...it is best when given for a few days in a row, consistently. Make sure that your doctor gives you some kind of anti-emetic (anti-nausea) medication as DHE can make you very nauseated if you do not take something to combat that. Phenergan and Compazine are common, but I prefer Zofran/Kytril.
Good Luck, and I hope that makes you feel better. Let us know how it goes, ok?