New e-mail. Problems with profile/log-in

My old e-mail which I used for creating my king account is being closed so I changed it to my other e-mail on my King profile on my phone in the CCSS app. But it hasn't changed in the Windows 10 app or on my other phone. If I try to change it, it says the e-mail is already in use. My profile picture has changed (not on the phone I used to change the e-mail). My progress and boosters are still there so far, but the gold is gone (2915 bars!) And also problems with progress in Bear Brawl and MTF. Same issue in CCS! Profilepicture has changed. How do I fix this? Am afraid of losing all my boosters. I'm not on Facebook. Previously I've had problems loggin in after loggin out, so a bit afraid to try that! When changing the e-mail; I also had to add a last name. Before I had only entered my first name.