Hi Marci,
Congrats on a successful trip to Italy! It sounds like you had a great time. I am also going to vote for the pressure idea. I've also been wondering about the relationship of weather pressure systems to tinnitus. I've read a number of posts lately where someone says that they've traveled and had the tinnitus stop or start/increase upon arrival. Personally, I've found that although my tinnitus is pretty much gone (after surgery - yes, I'm the oddball), that when I have extra pressure in my head (from a cold, or sinuses), I find that it's returned. Haven't related it to atmospheric pressure per se, but I think that idea has merit. Obviously, airplane cabins are pressurized. I'll be flying in the summer and will definitely see if I can tell a difference.
Anyhow, sorry for the rambling. Glad to hear about your trip, Marci!
Tamara