Welcome to HCM
I think you are anxious and that is why you are relating leg to pain to that cellulitis
I advice you to calm down, not to worry much. Probably the pain might be due to some muscle spasm or due to pull which you are unaware of.
I advice to complete the course of antibiotic that you are taking. For muscle pain
you can use over the counter analgesic
cream. If the pain is not relieved by cream oral pain killer can be taken.
I hope i have provided the information you needed.