straight from my drug book, levaquin produces these adverse effects: headache, insomnia, dizziness (check), nausea, diarrhea, constipation (check), vomiting, abdominal pain, dyspepsia, rash (maybe), pruritus, decreased vision, foreign body sensation, transient ocular burning, ocular pain, photophobia, vaginitis (UTI you're probably thinking of), injection site pain/inflammation, chest or back pain, fever, pharyngitis, cartilage erosion (source of your joint pain).