What kind of drug use or harmful behavioral patterns are or have you struggling with? Consider making your own recovery journal thread in SL.
It is really useful to document one's process. Particularly here, as we won't think any less of anyone who relapses. More often than not, with a chronic condition like substance use disorder, "relapse" is the name of the game. Doesn't mean all's ended, just means one needs to try to mix up one's approach a bit. Reflecting back upon what one was thinking, one's plans, etc., can really help one figure out what works and doesn't (plus the feedback can be very constructive and reinforcing in a positive, individually organic kind of ways.
What kind of rehab is it? I mean, what kinds of treatment do they provide? Is it 12 Step based or focused on clinical medicine?
I think I tried (was manipulated into trying) four or five different inpatient abstinence only based rehabs. I've known people who have been to 17+ rehabs. Basically a big waste of time for me, ended up doing more for loved ones not knowing how to handle their relative was a heroin user (what did the trick for me was outpatient based ORT and mental health services).
Whatever you do, try and plan out what is going to happen after rehab. Such places are notorious for not providing meaningful (or any actual) aftercare - something that is absolutely crucial (though you can set it up for yourself with a little ingenuity and research) to re-entry after treatment.