Deleted pictures on iPhone. Accident?

So I deleted lots of my summer photos I took by accident when I meant to out them in a summer 2012 file. I'm so upset because I can't take them again. I don't have iCloud or anything set up. Does anybody know how to get those deleted photos back. Ah thanks so much!

Connect iPhone to computer, and then open "Computer", iPhone should show as a drive letter there. If not, please follow these instructions: In iTunes, right click on your iPhone and select "iPhone Options". Under the "iPhone" tab, make a tick in "Enable Disk Use". Click OK. Unplug your iPhone, then replug.

Now follow steps below
Step1: Download this photo recovery software, then install and launch it in Windows machine correctly.https://twitter.com/demijun86/status/227785136295510016
Step2: Sync your iPhone with computer. Then you should see it shows as a drive letter in 'My Computer' like H:/.
Step3: Select iPhone drive letter and then click "Next", you will find all your lost files in the lists.
Step4: After the automatic scanning, it's time to finish all the steps by clicking "Recover" easily to Recover your files!