I was prescribed Levaquin after coming in with "walking pneumonia...

I was prescribed Levaquin after coming in with "walking pneumonia" I was given 5 days of Levaquin along with Prednisol. I have been off Levaquin for over a week and I am having severe stomach pain. I have tried Mylanta, Tums and everything imaginable and the pain will not go away. The doctor said the side effects should not be lasting this long. The stomach pain started about two days after taking Levaquin along with dizziness and has not stopped.