Verb conjugation of "differ" in English

It would be an advantage if you could send it via DHL, UPS or another Currier, because the parcel was lost once when we sent it with regular mail. Please send me a reference number after you send it.
Anyway, there are a lot of people on board and I no matter how high the waves may be, I always suffer from nausea or seasickness. I have not been on a small boat before. I will have to vomit.
I live near London. In March I will be going to Italy to visit friends. It will be my first time in Italy, I am totally excited. See you soon hopefully. Lovely greetings and best wishes. Anne.