OMG... How does this happen? What is malfunctioning?

From what I've been told, this is a serotonin neurotransmitter malfunction. Serotonin is supposed to be released from one neuron, cross the synapse and carry the message to the next neuron. Sometimes, rather than finishing this transmission at the receiving neuron, the serotonin returns to the sending neuron then makes the same crossing with the same message.

Increasing the availability of serotonin and/or other neurotransmitters can help this transfer complete without the re-uptake.

I think my anxiety is more because everyone immediately around me keeps saying I am losing my mind, and then I start questioning my own sanity. I see the psychologist tomorrow

You aren't losing your sanity although it may feel that way. Believe me, I understand.
I have this problem also as well as obsessing about my thoughts. Like I'm too aware of my thought process. Our broken lil brains can't process and get rid of thoughts like others can.

I'm seeing a psychologist and it's pretty basic stuff about breaking the thought process she taught me- which is a lot harder to do than it looks on the little paper I got from her. I obsess about my sanity which makes me feel insane Makes my anxiety off the charts.

I have something similar but my mind seems to focus on the negative news stories... Like when I didn't know I had a concussion yet and my anxiety was at its worst, which made me depressed because I thought I was like dying or something.. But when I was looking at my Facebook feed...I see "Robin Williams commits suicide" like that came at the worst time for me so now when ever I see a movie of his at the store or someone mentions him on TV its a instant depressed mood because now whenever I think of him I think "depression and suicide"..I have learned to deal with it though like I can brush it off but for a while it was bad.

Thank you for your posts. I guess it just comes down to no one understands what you are going through except those who are going through it with you.