It is not a good idea for you to take this trip. Odds are, since you are asking the question, that deep down you already know that.
You said you "got your first blow out in I have had since the diagnosis" and you where out of work for 4 days.
The odds are quite high that you would have a repeat of this during this trip.
Every time you have this problem, you are making you spine situation worse. It is quite possible that your discs are in worse shape now than they where 2 years ago when you had your MRI.
What you really need to do is get an evaluation with a spine surgeon, either a orthopedic surgeon that specializes in spines or a neurosurgeon that specializes in spines only. Then have a new MRI ordered and go from there as to the best course of treatment for what is going on with your spine.
What you shouldn't do is go on this trip.
Good luck
Fran