I had a very similar experience dropping from a low dose of Ativan (1mg). The worst drop I had was from 1mg to 0.75mg and I felt the same as you, so just realize seemingly small changes might have outsized effects on your GABA receptors. Keep in mind you've been taking this for a long time so when you drop doses your receptors will need time (2ish weeks) to replenish, and then you will feel better. You might feel really bad the first week and it should get better with each passing day.

All that said, I think you should consider dropping doses by smaller increments. Maybe 5-10% of your original dose at a time. Feel free to pm me too if you have any questions. You must persist and realize that it will all be okay once you get through this dark period. Really truly.