I have all of the things you describe on a daily basis. Further, my most severe panic attacks or meltdowns result in an inability to form thoughts, talk coherently, and/or screaming.
Additionally bare in mind that some of the things you describe are just normal. Knowledge and skill will never be constant and you will forget stuff, and some days this will cause anxiety, and some days anxiety will cause this.
---------- Post added at 11:02 ---------- Previous post was at 10:59 ----------
Also Etymology can be useful for word confusion. You will find that meanings of words are even less clear cut than you think. https://www.etymonline.com/word/engine