In a way...yes. I understand your problem since English is not my native language and I live in the US now.
I went back to school when emigrating here. At that point, I just emigrated to the US, coming from Germany. German is not my native language either. I studied foreign languages in the US. Two other different languages. And these two languages are not my native languages either.
I used to work as a tutor when in school (in US), tutoring German, the two languages that I was majoring in, ESL and sometimes volunteering to tutor Logic.
It was a very stressful period in my life. New country here, no family except my husband, no friends at that time (here in the US). I had students coming for tutoring that were not fluent in English yet (international students for example). And I had to explain to them the German grammar ... in English. Or the types of arguments (Logic)... in English. I had a student once, he was from South America, spoke little English. He had a handicap and was difficult for him to articulate words. He needed help for his German class. For grammar. Imagine teaching him about der, die, das and dative case! He was very intelligent and driven so...we made progress.
Yes, stress is going to mess up with your brain. You start to mix up the languages, the words, the grammar, you need more time in your head to find the right word while in conversation etc. It happened to me in the past and even now sometimes. When I'm ill or in pain or very stressed out. It can be funny sometimes, ha ha.
I used/use meditation a lot to relax. Also having a clean diet and exercising in nature. Hobbies (I knit) and not watching the news daily also...are very very helpful.
Take good care of yourself.