Help! I'm Chickening-Out on My Husband's Dream...

[FreeWilly]

My husbands dream has been to do an extended sailing trip. He sailed as a young man but has had limited experience since with larger boats. We were just on a trip in BVI and all went very well. Recently a number of life events triggered a decision on our part to get a boat (cat for safety/livability reasons) and spend a year sailing in the Caribbean. We have an 11year old daughter and the idea is to home school. We are selling our home to facilitate this and are intending to relocate on our return to a location I have wanted to move to. However, now that the house is listed, and the reality of what we are doing is setting in, I am having an uncharacteristic panic attack and I don't know if I really want to go through with this. I am nervous on boats and possibly slightly claustrophobic (another reason for the cat). I've started to worry about all that can go wrong and I'm afraid that I'm going to back out on my husbands dream. I feel terrible because he has never been happier..planning, reading everything imaginable, and learning about boats and their parts. We are both competent people and logically I know we can handle this, but I guess I just don't feel like adventuring anymore. I am close to 50 and my husband is in his 60's, so I think its now or never to get started with this and at the moment, I'm happy with never. Any advice, insight, comments???
Thanks!