After reading your post again, since it has been 2 years, results for you may not be as good. It is unfortunate to say, but statistics show that disc symptoms that continue for extended periods of time tend to linger on longer and may not fully resolve. The ESI is best done as quickly as possible when it is appropriate. Think of it this way, the disc has bulged and it has been 2 years - the surrounding tissue and surface of the disc are now going to scar down to prevent any further bulging, but that scaring will also limit the amount that the disc fluid can recede.
This doesn't mean to give up on it, especially if you haven't gone for any formal therapy. Just increasing lumbar stability, performing mckenzie's (if appropriate), and getting some manual therapy can be very beneficial.