I already answered this thread, but it's one of those questions that you might answer differently at different times, right?
My answer was "imbalance". On days when my anxiety is at a manageable level, and my brain is at least half speed, my balance issues seem the worst.
On days when my anxiety is at "pending doom" level, I'd trade that symptom (assuming it's a symptom) and keep everything else twice.
On days when I can't focus and can't remember and can't think and sound as though I've never taken fourth grade grammar, then cognitive gunk would be the symptom I'd get rid of in a heartbeat.
From another perspective: if I had one of the symptoms that some of you have (visual impairment, loss of the ability to walk at all, severe unrelenting pain, severe uncontrollable muscle spasms, and so on) I would revise my answer...again.
I wouldn't want to trade any of my "worst" symptoms for one of those I just mentioned.
I know I'm off the track from the question, but that's another one of my symptoms: whatever rolls through my mind rolls off my lips.