It can take some time for mind and bodies to heal - especially if you drank destructively for a long time.
Sobriety hasn't affected your quick wits - it was the years of drinking did that.
We *think* drinking helps our performance because we get our fix and the angst dissipates...but meanwhile overall every bender is dumbing us down...
It took me a while to get my 'game' back soberly but I did.
You will too - but only if you stay sober.
D