My iPhone 4S won't slide to unlock?

This morning, after updating a few apps, my phone no longer resonds when I swipe to unlock it. I know the touch screen works, as I have the assisstive touch button (my sleep button is broken) and I can drag that around all of the screen fine. I can also swipe up and access the settings panel, but the actual options don't respond to my touch.
I have iOS 7.0.2, and I don't know if there's a new update available. I tried to plug my phone to my laptop to see if I could update, but iTunes no longer recognises my phone.
I asked Siri to show me the unlock key pad so I could type my password in, but the number buttons are unresponsive. Another thing with using Siri - I can hold my home button down to get him to work, and once he's answered my question I can't tap the screen to ask another question; I have to hold the home button down again.
Because my sleep button is broken I can't reset it or turn it off, so I told Siri to play music at full volume, turn my wifi off, turn bluetooth on, and turn the brightness on full so it runs out of battery fast.

All I can do is hope it works again once I charge it up after draining the battery. Is there anything I can do to fix this problem if it continues?
I'm a student so replacing the phone is out of the question- I'm broke. I know it's not a hardware problem because my touch screen does work. I'm thinking maybe one of those apps I updated was dodgy and had a virus attached to it or something, as it only stopped working once I updated. HELP!