Did you have them as attachments to a post or posts in a thread, or uploaded to the Photo Gallery?
In the former case, you will somehow have to locate the thread that your posts were in by trying to recall the Subject and locating the thread.
In the latter, click on Photo Gallery in the main tool bar and then click on Your Media (individual photos) or Your Albums (groups of photos). From there, you and your memory are pretty much on your own.