Anxiety about being a good enough dad is getting out of control

I find myself googling stuff like 'is my 3 year old developmentally behind' at 2am. I worry constantly that I'm messing him up somehow. My wife says I need to relax but I can't turn it off. I feel like I'm failing even though logically I know I'm a decent dad. Started therapy last month but only had one session. Anyone else struggle with this? How do you manage the anxiety?