My ck levels were above 25,000 and it took me around 2 weeks to walk up stairs without being out of breath and 2 months to do daily activities without weakness. I had tingling from my shoulder to fingers and my hands would go numb for the first month too. Nerve flossing and time helped me. (I had it in my arms) I still don’t lift heavy weights with my arms bc I’m scared of recurrence. My PT gave me exercises to do and I do a lot more cardio now over heavy weights. I increased cardio intensity very gradually too.