Is it then a real next action?
Next actions are only those which you can do next. The reason not to call Peter seems real, and therefore 'call Peter...' does not actually belong to your next actions list. Since you have already called him yesterday, this item belongs to Waiting For list. Then in a weekly review you could decide whether he had enough time and whether this action can come back on the actions list.
As to the second item: If you think your face really matters for the meeting, then again this is not a next action. Just estimate when you think your face will be better and add a calendar entry to call (or to add a next action to call). But does your face really matter, or is it just an excuse?
To summarize, if you really think you are not ready for an action, then that's not a next action. Find an appropriate place for it, so that during the review process you will be able to see whether it can become an action.