Hi!
Yes, I agree with lots of the above. I would also like to add two things:
1. Make sure you do not have an infection brewing. I know this is rare, but it is worth checking. Look for redness around your incision and battery site. Also, check if it feels warm to the touch. If either of these, call your doc and have the doc check it out.

2. As for the inflammation, I'd add the thought of putting ice packs on the site. It won't harm your battery or mess with it, like heating pads will, and it might help with both the inflammation and the pain. (I like the gel kind, which are flexible!)

I have had my spinal cord stimulator since 2008 and I still usually sleep on my rightt side because of that. Also, if I'm lying on my back, I make sure the area just above that battery site is padded and supported with a pillow.

Just some thoughts!