Hi! From what you have mentioned, it seems like you are going through through multiple issues, that range across:
1) Concentration related concerns
2) Forgetfulness
3) Emotional concerns
4) Inability to learn and memorize new things
I understand how working through even your daily routine might be very difficult while going through these concerns.
However, there is an inherent problem with "getting diagnosed". Though a diagnosis seems to be the easiest way to address the situation, we must understand that most of the time, a diagnosis can be restricting. We can first understand what you're going through in a detailed manner before jumping to a diagnosis. This can be achieved in a therapeutic setting, where psychologists can assist in understanding the root of all the concerns you are facing. According to what you have mentioned, this seems to be extremely distressing for you. Hence, it is integral for you to seek help by consulting a psychologist. This will not only help you "get diagnosed", but will help provide ways to address these concerns in an appropriate fashion.
Meanwhile, I suggest you start maintaining a journal or a to-do list in order to ensure that you do not face issues with work and your daily routine. It will help manage your issues with forgetfulness, and help organise all the things you need to do in a detailed manner.
You can also continue with meditation. As it is already helping you, and is a healthy coping mechanism, it can help enhance your attention and concentration.
Next Steps
I urge you to please consider approaching a mental health professional to understand your concerns in depth. We can conduct a detailed assessment, that can be followed by a customised treatment plan to address the concerns you are going through. This will help you understand what you are going through with more clarity, and also help provide a detailed solution to the same!