Complete the text with the verbs in the correct tense (simple past or past perfect) I______ (check into) the hospital

I checked into the hospital in the afternoon. I was worried because I had never had surgery before and I did\'t know what to expect. But Jake stayed with me until they had told him that he had to leave. By evening I had already prepared for the operation. I waited for them to take me the operating theater. Before I had known it, the operation was over and I was back in my room. Someone left some flowers and a card in my room. They were from Jake.