i promise you are much more fucked up than you may think, anyone around you will be able to notice as i'm sure you're slurring your words and probably stumbling around when you walk
i don't know exactly what you are expecting to feel off 17 mgs of lorazepam but you're not going to be 'high' or euphoric by taking more, i tend to have the same problem with benzos by thinking i'm not high but the reality is you are def fucked up off that dose, tolerant or not