Hi Jennifer,
thank you for replying.
No, I haven't been evaluated by a professional.
I always believed, I didn't have any issues that were "severe" enough for that. I actually never noticed I had any issues.
All of this developed so insidiously over a long period of time that I didn't really realize it. I don't know where it comes from. Maybe I don't even have any serious issues. Maybe I just got lazy and this got me out of practice so that I slowly lost my skills. Probably I am that much of a failure...