Does Aciclovir Or Chicken Pox Cause Pain In Lower Back And Legs?

hi i am 32 years old height 5f had chicken pox when i was 12 years old and got chicken pox at the moment. i am taking 800 mg aciclovir 5 times a day for last 4 days. saw a doctor 4 days ago. i now have bad lower back pain and pain in my legs. is this the chicken pox or to much aciclovir? thanks