Welcome to the Candy Crush Saga Community
Do you have a question or need help with your game? Ask the Community.
Follow the steps here. I can say that they have worked for me in the past when I lost my connection. They are pretty simple but should get you connected again:
https://care.king.com/en/candy-crush-saga/loading-crashing-issues-ios
It's not possible to get your boosters back though sorry, once gone, they won't return as they don't sync with Facebook.