It's not like other highs, really. It's strange because you might not feel it after some time has gone by but others may still notice it.
The high is difficult to describe, but it's not so much euphoric as it is... relaxing? For me, my legs feel heavier, and my head feels heavier, and there's a feeling of peacefulness, again, not euphoria. It's difficult to describe.
To be honest, I haven't much experience with lorazepam. I am more familiar with alprazolam and clonazepam.