Levaquin and saline solution

I am a 52 year old women , except for a yearly resistant sinus infection I would describe myself as very healthy and have only minor aches and pains for my age. I was prescribed Levaquin by a walk- in physician after 2 months of a sinus infection. Within a week I felt 100 years old . I could barely get out of bed, the pain in all my joints was excruciating the first 5 minutes and didn't improve a lot during the day . I didn't think my legs would hold me upon rising from any position. After one week of finishing the drug I started to feel better.......it has been two weeks now.... I'm still sore and weak , especially noted in hands and legs .

While taking this, I have experienced water on my knee, aching in my leg and then a problem with the right knee, aching in arms and shoulders. All of this could be something else, or at least the fluid on my knee. I had an MRI Saturday and will hear in a few days.
So what is the best med for sinus infection which is why I am on this.
Thanks.