I took levaquin for bronchitis after being on amoxicillin for 10 ...

I took levaquin for bronchitis after being on amoxicillin for 10 days already and not responding well. So starting Nov 3rd I took this drug ( levaquin ) for seven days, I felt horrible tired sick nauseated and having calf muscle cramps, I finished the medication and before I finished it also started breaking out in horrible itchy hives that i am still being plauged with as of the 23rd of nov, have been to the dr three times and am giong to an allergist on dec 16 for skin patch test, now I am wondering if the hives are being caused by anthing at all EXCEPT the Levaquin after stumbling upon this site ( thank God for that) i was wonderin exactly how long this drug stays in your bloodsteam. I thinking that pehaps my body immune system has attacked this drug for the poison that it is