my watch stopped working

Hi

Try force restarting your watch: press and hold both the side button and Digital Crown for around 10 seconds, until you see the logo.

If that does not help, next try charging your watch for around 2.5 hours, making sure that you follow the charging instructions here:

Check your battery and charge your Apple Watch - Apple Support

After that time, if it has not already restarted automatically, remove it from the charger and:

• Try restarting it (by pressing and holding the side button until you see the Apple logo).
• If necessary, next try force restarting it again.

More information:

If your Apple Watch won't charge or it won't turn on - Apple Support

You may be able to save yourself some time by trying the steps in my previous reply.