I'm so excited for you and am thrilled that your GI is very forward thinking. I expect that your aches and pains will decrease, if not go away completely.
3 days of treatment was very hard for me to handle, but I was also extremely sick at the time. I usually needed to take a day off in between. I use Gamunex as well; I react to the other brands so have very specific instructions with the blood bank to only Gamunex.
It's a very long infusion but you may be able to bump the infusion rate up as you go. I'm still at a pretty slow rate so it's a 6hr hospital day; shorter now that I have a port so no more IV's! Bring books, computer etc as you'll need to keep occupied. Once the infusion starts I'm not allowed to leave the floor so I have to bring food as well. For some reason I'm usually famished after the infusion. I've heard this happen to someone else; that you go home, eat the contents of the fridge and then sleep.
I was once in the hospital with a horrific UC flare....40x day/nights....I had to convince my hospital to treat me with IVIG which took some time as it's off label. Anyway, after during the first dosage, I could feel the difference in my tummy. The next day I was down to 17 times, then 9. I was discharged home 3 days post infusion. Despite my progress, funding was cut and my treatment become monthly
As far as pre-meds I take 2 extra strength tylenols and gravol. When I get home I take 2 more tylenols and drink plenty of water.
When is your first infusion?