How to deal with feedback at work

Oh wow! I was recently let go from a job for basically the same type of reason. I was only at the job for a month the first two weeks I was doing a two week notice at my previous job so my training time was split between the two jobs. I was coming in on weekends to train with the person who I was taking over their position and when I would come into the office I was receiving a lot of pressure from my direct supervisor about what I have or haven't learned so far. While I felt like I was killing the job, and not messing up anything., they felt like I wasn't learning fast enough. Even something as mundane as answering the phone and transferring the calls, because obviously I don't know the answers yet was still placed on me while I was learning the bigger crust of my job. And the others in the office were told not to answer the phone even if they were available to answer it because it wasn't their job. So I got depressed, and would obsess about how they viewed me in my role, why they wasn't seeing what I had learned so far and was doing well so far and I became withdrawn. Basically I was thinking if I keep my head down while I'm learning then it would give me an opportunity to learn and later my personality could be displayed since I was on deadlines and urge to learn everything at once. Ultimately, the lack of sleep that I was receiving for thinking about the issues while at home along with all of my mental and physical health issues which are many, I ended up being fired for the job. I was termed "not a good fit". I have since, in the last 2 weeks since I was fired, tried to get the job back, try to explain more of the issue that was causing me not to be a good fit or to be depressed while at the job site. None of it was enough. So I am now job searching again, or the third or fourth time in 2 years. I know I'm capable of the shoes that I said I could fit, and taking the place of the other girl. I know this because I maintained a job for 32 years in which I was the girl who knew the job inside and out. This job I was recently fired from and some of the other ones have me questioning did I misrepresent myself? Can I really do it? Why or what about me didn't give them a reason to give me more of a chance to prove what I can or can't do. It is highly frustrating how much I have been obsessing over what was said or done by either party. I am new to the different terms of OCD. But r o c d seems to fit in this situation for me and I'm not happy about it. I'm trying hard not to continue reaching out my former employer of just one month. I don't say all of this to fill you with fear or doubt that you would be in a similar situation of not having a job, only to say that your post completely resonates with what I just went through. I certainly hope and pray that your situation just not turn out like mine and that you are given the time and proper training necessary to bully shine in the position. I didn't mention it but mine was not one of dyslexia but there was a lot of math involved in this position and I wanted to make sure that I was showing my work in case I was asked or questioned about why I made a certain decision, and basically the expectation was that no just figure it out in your mind and put the results down and let it impact whomever it was going to impact in whatever way it did. That did not sit right with me especially because one person would say one thing the other person would say the opposite I was stuck in the middle trying to figure out math in my brain which was taking longer than just using the tools that were provided and that no one else was using.