Shingles rash and pain

I’m in week 10 of shingles and still have crusted blisters in my arm pit. Why are they still there and how do I get rid of them? I feel like the pain won’t start easing there until they are gone. I had severe pain for 3 days in my left shoulder blade. When it started to ease I felt blisters on my back. I went to urgent care and was diagnosed with shingles. I took acyclovir for 7 days and then nothing. My doctor’s office wouldn’t fit me in and insisted I wait for a regular slot so I didn’t see him for 3 weeks. In the meantime i then got the rash and blisters on the underside of my left arm, in my arm pit and over the left side of my breast. The rash slowly crusted on my back leaving ugly scabbing and holes on my back. That left and I just have a large discolored area on my back that is fairly painful. The rash and crusted blisters on my chest took longer to go away and the pain only left the sides of the breast. I still have pain in the middle and top near my armpit. The last to start going was my underarm and armpit and the pain has been awful. Better than it was but ....... I’m worried I’ll never get rid of the pain but what worries me even more is the crusted blisters in my armpit haven’t made any progress in at least 2 weeks. I hope someone knows a magic way to make those go away. THey said the rash would only last 10 days to 2 weeks but it’s now 10 weeks. I have low-level MDS so I catch things easier and they tend to last longer.