I am also on lexapro and had a lot of the issue the same things happening to me. I also have Multiple Sclerosis so blamed most of it on that but then realized nope this is different, I was paralyzed by the panic attacks and started to have hot flashes(I thought were MS), brain fog and just pains in places that didn’t make sense. I again blamed it on MS, but waking up at 1, 2 or 4:36 in pure fight or flight, I finally went to a dr who told me I’m in perimenopause and asked if I wanted to do hormone replacement therapy. I said yes and thank you Jesus!!!! It’s not 100% but it’s 100% better than it was! I hope that helps you.