Just reading up on your story. I'm so very happy that you are going to Switzerland. Someone up there is really looking out for you.
Now, about the dating and the guys. I'm going to be honest with you here...I think you may come on too strong in the beginning. If someone really likes you, but you come on too strong, it will scare them away. I know that it might not seem like you come on very strong, but from your posts here it looks like you do. For example, you mentioned you and B3 were emailing each other short emails daily the first week after your first date. It may not seem like a lot, but IT IS. I think these guys are not calling back because they really, truly do like you, but they just need to create some space. A good guideline is to let them do all the calling in the first month. One date a week in the first month. 2 dates a week in the second and 3 in the third. I think dating is harder as we get older. It's not like in school where you can talk to the person every day etc. You said you wanted to be pursuited. Let them pursuit you. That means they take the lead. They make the phone calls, they ask you out, they let you know what they are thinking in terms of a relationship. I recommend the book: Mars and Venus on a date. It's a good dating guideline.
I also recommend you have a fantastic time in SWITZERLAND!!!! Yay! Congrats!