Stress/anxiety/depression

I am stucked in a overloaded work at my job, and I had to do overtime. It's been month and I think. it would be like this for months. The problem is that there is no much appreciation that should be, or no much acknowledgement. Instead being blammed for anyone's mistakes and errors.

It made me sick physically, but doctors say that this is the mental health issue. I don't know weather it is anxiety depression or what. I would like to exactly know.

It was a feb 2025 that the same job and same culture was the best according to me. The whole team is the same. Are my thoughts just becauee of the work has been increased? Or am I overthinking? Or am I right with my thoughts?

Yesterday, I was not well, and my whole day was in the thought of that work culture and my work hard and alot more.. I cannot stop thinking about that, I want to control my brain. Like people easily say that why do u think ao much? Or don't think about that or don't think too much. Seems like they can control there thoughts and what to think and what not... but when a thought just came in my mind, I am just stucked in a loop and it's affecting me and my life, my heart beats shoot too much it's racing.. it makes me like can't explain.

How can i overcome overthinking and how can i over come that loop of thoughts been irritating me? How can I stay away of anxiety/stress/depression or whatever attack is it?

My psychiatrist once told me that

"your brain is too sharp and amazing, but the problem is that you are always using it against your self."

How can I know if it is right? And how can I stop using it against my self?

I am sorry that I made you people read this much stuff. Just a try that it might help me.