Mickeyfan - Just thought I would try to make you feel better by reminding you that we all have our ups and downs.
My family is beginning to sound like yours. Although my husband still has a job (that can change at anytime...you just don't ever know) , we have had similar incidences lately.
My 23 year old has been having heart trouble. We think we have a diagnosis, but she requires a few more test to confirm. Very stressful!
Last week, my 16 year old crashed into a mailbox and did $2200 worth of damage. He is paying for the damage out of his own pocket.
We did cancel a small trip to help pay for my DD's medical bills and the car until my son can pay us back. However, I really think all your points are valid as to why you should continue with your trip. Go, maybe cut back a little and have a great time and cherish the memories!