Take it from someone who at 60 has had two bouts of Achilles pain in the past 10 years…eccentric heel drops…read about Alfredson Protocol. It is proven to work and get you back in the game. Do them, and you will heal. All the other stuff is window dressing.
This worked for me too. Also before any running I was told to get on a spin bike and place my pedal at mid foot and spin till I was at the point of breaking sweat and then run. I did that daily for 3 weeks and it worked. I still spin before I run, every time.