Welcome to the Beta Club
I've been taking it since 2002. My overall experience has been a good one. I used to take Motrin after a shot, but now only rarely.
My only problem is the site reactions. The pink/peach oval stays for quite some time. In the summer, I wear capris rather than shorts (to cover the spots) and a similar outfit for swimming.
I no longer take arm shots. A couple of years ago, a huge bruise from a shot shied me away from the arms.
If you have any questions/concerns, keep in contact with the nurses via Betaseron and your doctor.
I wish you all well!
Niko