Traffic accident in my brain

I'm a Japanese, but I live in Indonesia now, so I often use Indonesian.

I tried to speak English today, but I couldn't do so. Why? My mouth spoke Indonesian. I don't know why but my brain made show up Indonesian words only. I was really upset because I could speak English before. It was not fluent, but I could do so.

When I speak Indonesian, I use English words in a sentence because my Indonesian vocabulary is not enough. When I speak Japanese with Japanese friends who live in Indonesia, I use Indonesian words in our sentences.
When I speak English, I have used Indonesian words even though I try not to use it.

My brain is clashed. Indonesian language always clashes to Japanese and English. I have to try to separate parts of my brain. Don't clash my brain any more, please! haha

'I'm a Japanese' :  I'm Japanese

'I don't know why but my brain made show up Indonesian words only' :

I don't know why, but my brain came up only with Indonesian words, . . could find only . .

'vocabulary is not enough' :  vocabulary is not sufficient

'I have used Indonesian words even though I try not to use it' :

I have used Indonesian words even though I try not to use them

'My brain is clashed*. Indonesian language always clashes to . . ' :

My brain is 'clashed'*. Indonesian language always clashes with . .

*I should find a more grammatical way of saying this but it would be less poetic.

You could say "The different languages clash in my brain".

I think we all suffer from 'language clash' - it's an 'occupational hazard'

Traffic accident in my brain

I'm a Japanese, but I live in Indonesia now, so I often use Indonesian.

I tried to speak English today, but I couldn't do so. Why? My mouth spoke Indonesian. I don't know why but my brain made only thought of Indonesian words. I was really upset because I could speak English before. It was not fluent, but I could do so.

When I speak Indonesian, I use English words in a sentence because my Indonesian vocabulary is not enough. When I speak Japanese with Japanese friends who live in Indonesia, I use Indonesian words in our sentences.
When I speak English, I have used Indonesian words even though I try not to use it.

My brain is clashed. Indonesian language always clashes to with Japanese and English. I have to try to separate parts of my brain. Don't clash my any more brain , please! haha