I was right where you are - my son is now 19 and in his 2nd year of college, but when he was 8 years old, after my 3rd surgery, I was warned that I needed to go full boar on any drug I could find or I might not be around to see him graduate from high school. (My issue was short bowel syndrome and that tpn is/was hard on the liver).
It absolutely panicked me and gave me anxiety attacks, and of course I took everything they threw at me no matter how it made me feel. But, and it's a huge but, after my 4th surgery, that surgeon apologized to me for being wrong. Everyone's body is different, and mine adjusted to short bowel syndrome just fine. In addition, tpn (something, something nutrition
has been greatly improved over the last 10 years and patients are having much more success with it. I still don't want to have to be there, but I'm not as worried any more.
The drug you mentioned is out for trial right now. I was not accepted into the program because I don't have any changes in my CRP counts with inflammation, and that's the key to measuring the success of the drug for the study. (I've heard the stats are that 30% of Crohn's patients with small intestinal Crohn's don't present with an elevated CRP). I do have some Crohn's in my large intestine, which is also a requirement. So, since I am not PML positive, I decided to go the Tysabri route. My GI has me test every 3 months for PML rather than every 6 months for added reassurance. I am determined to be here for my grandchildren! I do have say, that other than PML, and that's huge, Tysabri is the easiest drug I've been on as per side effects. With small children I can see that being very beneficial. I've also done lots of research on PML, I'm sure you don't have a whole lot of time to sit and research at the computer, but look into how people contract the PML virus to begin with - it's pretty interesting.
If your insurance will cover it, you might consider going to the Mayo Clinic in Rochester. My doctor is no longer there (Dr. William Sanborn - he is now at the University of California in San Diego - if you could ever get in to see him, do it!), but when I didn't qualify for the Humira trials, way back when, he called my insurance company and got me on it before it even hit the market. Then they tracked me with their trials and I really believe that it was really beneficial. You might be able to get into a trial that you are more comfortable with that way.
Best of luck!