Just let your Tamogatchi relax. If it sleeps though, that will lower it's stress. So you should let it rest for a while.
Well first thing is first: sometimes, if to stressed out, your Tamogatchi wont want to do anything. So if so, you should let it sleep. Just adjust the time when you usually go to sleep. If that doesn't work, i suggest resetting.
The only way to get Eon Mail in Pokemon G/S/C is if you have a Pokemon Pikachu (a special Tamogatchi-type pedometer), which you can then send 000 points to your game through Mystery Gift.
ask it if it loves the furby that you want it to love if it says yes ask if it wants to get married