Talk to General Physician on Pain Around Knee Muscles

I was diagnosed with Hpylori infection a month ago. Doc gave me Amoxycil leflox and Dexiva. All the issues settled. My stomach is. perfect now. No acid reflux, no pain.

But the day I started taking above medicine, I felt fatigue in my thighs. The fatigue or pain that feels when a person suddenly hit a gym and the next day when he wakes up, he feels pain or tiredness. Same issue is with me. Now pain is concerned around knees. It doesn't feel as if in bone but muscles around knee. I mean you can say 6inch above and below the knee is pain area. Whenever i get up from toilet it becomes so uncomfortable that I need to take support. Before Hpylori treatment, there's wasn't any issue like this but only stomach pain n acid reflux. i had a very active lifestyle. but after treatment, I'm unable to even walk faster.

what could be the issue?

I'll appreciate if someone answers.

Thanks