I'm going crazy

[Corsu]

I've been speaking the local language at uni, work and with friends for 7 months now. It's going very well.
Except I woke up yesterday to have a complete mental block. I have switched around the numbers 4 and 6 in my head. I hear the right word and it automatically matches with the number 6. or 4.

Please someone tell me that this is a normal part of immersion? I honestly feel so stupid getting it wrong in front of the shopkeeper when I have been chatting to these people quite confidently for several months now!

Normal. I came back from France after a year and had lost 30% of English vocabulary. Family thought it was hilarious as I searched through a dictionary in order to explain things. Don't stress, it will come back.

Normal. The next step is to completely forget English words. I've spent days trying to remember words and not even complicated ones either. The most recent one I forgot was O as in the letter O

It's so infuriating!
I've already had a few problems talking to my parents back home. What exactly do we call the old women who do all the odd jobs around the city/ uni/ hotel/ home? I keep calling them Aunties which is obviously very strange!
Same with the air conditioning - I'd never used it before I arrived in China and now the only word that comes to mind is the Chinese!
I'm glad to head it will pass when I return home...

I live in the US and so it's essentially the same language, but I still get frustrated as I seem to have "forgotten" entirely normal English words on occasion.

I'm very glad to hear this is a common problem. It's still happening, but kind of easing off. Brains! They are just there to cause problems!