I kind of understand what you're saying. That speedy brain wasn't really a friend to me, though. It came with crippling withdrawals later on, anxiety and depression.
I haven't figured out your job either, but were you drinking around the clock? I used to get bursts of creativity in the first couple hours of drinking but I couldn't hang on to that - it was in short bursts. So were you drinking during these presentations? Because that isn't real creativity, and eventually the amounts would have increased and you would have been found out - which I can't imagine would be good for anyone's career.
It took me a long time to feel "together" again. Are you getting some regular exercise? That affects my thoughts more than I would have imagined. That and regular nutritious meals. If you have been restricting food to lose weight that could be part of it. I get dull when I'm underfed.
It's not worth drinking. Congrats on the weight loss.