If anyone isn't having success with IR, I recommend XR.
SWIM[0] (who couldn't get IR) didn't get much lasting value from XR, because it took too long over the course of the day, but discovered that opening the caplet and crushing the contents before ingesting made for a bigger immediate kick. SWIM also found it hard to find a consistent optimum dosage this way, but experimenting has been helpful.
Well, we're talking about therapeutic use, here. I think upping an XR dose (no more than 30mg XR) would be more effective than crushing pills and bumping them for an "immediate kick".
SWIM[0] (who couldn't get IR) didn't get much lasting value from XR, because it took too long over the course of the day, but discovered that opening the caplet and crushing the contents before ingesting made for a bigger immediate kick. SWIM also found it hard to find a consistent optimum dosage this way, but experimenting has been helpful.
0: http://www.drugs-forum.com/forum/showwiki.php?title=SWIM