I googled pet hedgehog heart rate and found that the normal is 190 heartbeats/min, but it can get down to 20 heartbeats/min during hibernation attempts. Sorry I did it so fast and I closed the window already so I don't remember the website I got the info from, if you google it it will be one of the first entries though.
How warm is he? You might want to turn the heat up a little bit for him, as he might benefit from the warmth when sick. And make sure he is eating/drinking... I'm so sorry I can't help you more. But my heart goes out to both of you.