Hi Nhots,
If you do have to leave LL, don't leave cold-turkey (if you pardon the expression). Try and get a condensed Route To Managment from your counseller - That way, you can learn a few tips on keeping what you have lost off...
Also, some people have an adverse reaction to sweetener - did you use to take them before Lighter Life? do you use them a lot now? if so, maybe try not using them for a while?
Also, Lighter Life have Doctors, who I have emailed in the past for information, and they have responded. You could try dropping them an email...