Sounds like a few snarky commenters below, but I had a similar issue with my Band at first. When I used to wear a normal watch, I would wear it kind of loose so that it could slide around a bit and typically rest at the "bottom" of my wrist, right where my wrist meets with my hand. I also wore it "face up" like a typical watch. After only a couple days, I started having pain in my fingers and top part of my hand. I removed the band for a couple days and the pain remained. It was even sore to the touch like it was bruised. I also noticed that the heart rate monitor was not always detecting because I was wearing it so loose.
So, instead of ditching the whole enterprise, I decided to wear it differently. I moved it further up my wrist so that it rests above (closer to my elbow) the bony protrusions of what I think is the ulna and humorous bones (don't know if that is the correct anatomy or not). Basically about 2 finger widths further up my wrist from the joint with my hand. Also, at that location I was able to tighten it up snugly so that it doesn't slide at all. I still have it face up.
Although awkward at first, I got used to this location after about a week and the pain in my fingers and hand went away completely. I wear it almost 24/7 and only take it off in the water/shower and when I sleep. I think that location also makes typing on the keyboard a non-factor as well.
Hope that helps. I would just advise to be patient in selecting a new "wear location" if that is an option for you. I've been wearing it for 5 months now and absolutely love it!
Thanks,
LocoKip