No function at apple watch

I updated my watch the first night after new iOS was available. In the morning after that the watch did function a few hours, then it became black and had no more function since that moment.

I can't reset the watch and new loading brought no success. The backside of the watch became warm after loading.

Do anyone knows what to do???

Thanks at all!

Has invited:

howapple - hello

Favor from:

Again hi...

sorry ... i didn't read your answer in the right way...

i pressed only the side button an NOT side and crown together. Now ist seems to happen something.

Thanks again.

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