The most likely cause of missing all AdWords data from Google Analytics is that your clicks from AdWords are not "tagged". Without tagged links, Google Analytics cannot identify where website traffic is coming from (in this case, Google Analytics cannot identify that traffic is coming from Paid Search campaigns).
Google AdWords typically automatically tags your AdWords campaigns, but it is possible that auto-tagging could be disabled in your account. Follow the steps below to turn AdWords Auto-tagging back on in order to see Google AdWords/Paid Search data in Google Analytics for the future.
1. Log in to your account. (If you are logging in via an MCC (My Client Center) account, pick the client from the dropdown).
2. Under "My Account", click "Preferences
3. In your preferences, under "Tracking", enable "auto-tagging"
And your Google AdWords data will now show up in Google Analytics for all future campaigns!
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