HCA: Hermit Crab Association

HELP ME!!!
Things have absolutely gone out of control with my crab, and I don't know what to do!

I've been at my dad's house recently, and my crab is at my mom's. When I came back to town, I thought for sure my mom had taken care of my crab over the course of the summer. What I came back to was a total NIGHTMARE. The crab is pale white, the tank is full of these odd size varying bugs, the crab barely moves unless misplaced, he doesn't take any interest in food or water, and he hangs out of his shell like crazy. Also, I haven't seen his antennae ever since I got back a week ago.
How do I nurse my crab back to health and get rid of these bugs? Thanks!

The bugs may be annoying but they most likely won't be harmful to your crabs.
Get the temp and humidity back up to appropriate levels.
Be sure you have both fresh and salt water.
Re-wet your substrate if it has dried out.
Feed a good balanced diet that includes protein and calcium.

If you would like us to identify the bugs, post photos of them.