Ami - I know from the outside it seems scary...but having gone thru it twice - it wasn't that bad at all. Not sure though what the heck the 14 day treatment is...
HiCy is 4 days if in-patient chemotherapy. Then they release you to your home (or in my case, I was renting an apt in Baltimore near Johns Hopkins). I then traveled to Hopkins daily for a few weeks - where they took blood every day...and for a few days gave me a growth hormone to boost my immune system to go back online and build up. Those who did HiCy in Chicago had to stay in the hospital the entire time...they weren't released until their white blood counts were back online at a decent number. I think I spent close to 3 weeks in Baltimore in total.
I know it sounds scary to be without an immune system....but they only keep you at zero for a day or so before giving you the growth stuff to get you back on track. Yes, for a long time (several months) after the treatment you need to be careful with what you do (like don't hang out with sick people and wash your hands an awful lot)...but it wasn't that bad.
My mother died of cancer and I watched her suffer thru chemotherapy for years....and this was NOTHING like that at all. First, because we aren't "sick" with cancer - the chemo hits us differently...yes, it kills our immune system....but we're not "sick" to begin with, so I think that makes a difference.
I don't know anyone that "almost died" from HiCy. If done right, if precautions are all taken....he should be totally safe.
I would look into exactly what protocol they are planning to do. As I said, I watched a sick mother go thru chemo for years...and when I first found out I had MS, and I saw that they used chemo to treat it - I said I would NEVER touch the stuff...but this isn't regular chemo - this is a 4 day big blast of it and then that's it. Yes, some people got really sick...and then some, like me, didn't even throw up once! I was totally fine....even in the 2 weeks after the treatment while still stuck in Baltimore, I went out to the movies (during non-crowded times and had to wear a mask, but still, I was feeling great).
I wouldn't do the lower dose or something that took longer to deplete the immune system. But that's just me.
Make sure he finds out everything he can before he does this!