i have that all the time to, i don't no if its normal, but your definitely not the only one.. it can be a problem even talking to people, you just can think of words or put sentences together properly, it very weird :(
Not to but in anything, but, I'm not sure about the anxiety or bp, I know stressful things or thoughts have made me lock into one mode or the other at times as well as failing to recall stuff. Afterwards i think it may be a blessing that some of the stuff is forgotten. Not being able to function has never really been a problem as much as not stopping when I shoud. I know this is really help, sorry, I suppose the only thing normal about it is that its not going to be normal, we just have to find our own ways of working around an through it
Mark