If you're chasing a high with lorazepam, you're barking up the wrong tree. From what we can be scripted in the US, it seems like temazepam and midazolam are the only benzos that reliably produce euphoria. All the "euphoria" that is felt by people taking Lorazepam, Clonazepam, Alprazolam, etc. are usually the euphoria felt from finally feeling a manageable level of anxiety rather than a debilitating one. That kind of relief from anxiety can be divine.
Benzos are extremely powerful tools; if you take that same tool and overuse it or abuse it in a chase for intoxication or euphoria, you WILL end up getting burned by ending up with a nasty benzo addiction. Just read around BL or Erowid (highly recommended) for a bit, you'll learn all you need to about the shitshow that is physical benzo dependence and how horrible it could be.