There's no quick way to navigate back to the last question(s) or answers you posted if you navigate away from them, especially if there has been no activity. You may be able to click backwards in the current tab sufficient times or navigate to the tab you had it open.
Allowing easier access to questions without activity may encourage appropriate modifying (editing or even deleting if a solution has been found). Bad questions that should be edited are the ones likely to be subject to less activity.
This problem is also prevalent if active on more than one SE site. I know that you can go to the respective profile/activity page, but this is still a little tedious.
- Add entries for recent questions and answers to the inbox. These could be (automatically) cleared when there is any activity (upvotes, comments etc) on the same question to avoid excessive clutter.
- Create a new tab for recent activity and redefine the purposes for the inbox and achievements respectively.