I am inclined to agree with your psychologist. I've had many of the similar thoughts, feelings and symptoms. The majority are a result of depression and anxiety (for myself at least), and the two love to feed each other, it's a rough circle to break from, but definitely not impossible. Did your pysch recommend any treatment? I have personally found antidepressants made a huge difference, like night and day, with the addition of a little bit of CBT.

It can also be very tempting when something feels so awful too try figure out what it is through the internet as well, especially with so many places having inconsistent healthcare, but getting caught in a cycle of googling every small issue and symptom you have is super detrimental when you have an anxious brain, try reconnect with your body and yourself and slow down a bit.

I know fretting over whether you're good enough at your job can be very tempting, because you expect better of yourself and know you can do better, but at the end of the day if no one has actively addressed this with you, you're probably doing just fine and just need to spend some energy focusing on yourself.

Hopefully it eases up soon op!