Don't know what to do

Just go an see a pro and stop trying to self diagnose. They'll no doubt have you back up and running in a matter of minutes.
 
Get a professional to have a look at things for you as they know what they are doing - it'll be worth the slight expense instead of trying to figure it out yourself and going around in circles!

For what it is worth, I had a similar problem a year or so ago and what had happened to me was that I had the ball too far forward with all of my clubs - hence the sudden fade/slice. My club pro spotted it almost immediately and small faults like this always come down to getting the fundamentals right of grip, posture etc.

Hope this is hopeful.
 
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