Tongue in a knot

So, I wanna ask everyone, since we all speak several languages.


Do you find yourself physically become tired of speaking just one language?


Hear me out.


When we were in high school, 周りに日本語と英語どっちもしゃべれる人がたくさんいたから、whenever we're having a conversation, 先に思いついた言葉で話してたでしょ？(Of course, you can read my sentence, no biggie.)


Now, 最近, likeここ一年、I catch myself studdering and having to think about what to say for the longest time, and I don't remember ever having as many speech problems in my life!


I'm wondering if my brain gets down right tired of speaking English all the time--at work and so forth, and my mouth just gives up on me half way through the sentence. 


Or, maybe it's cause I come home and watch a bunch of Japanese TV instead of practicing more Engrish...


Or, maybe I just have a brain tumor or something....


Do you think this is just common grounds for bilingual speakers?