I initially had a great deal of trouble with this. I would even forget what I was talking about mid-sentence! It is better now, but I still have mixed-up words daily word finding problems every day. I also have a funny problem where everyone in my family is now "Bill" (my husband's name), and I don't know why I do this! It's great though, because everyone just answers, "which Bill?"!!!

I have begun to read out loud better since getting my prism glasses, but I still have those pauses where my mouth wants to say the word, but nothing comes out. Just try not to get too stressed by this, because then it just seems to get worse.

I do believe it is just fatigue or stress related, as mentioned by others here. I prefer to write rather than speak, too.