Not happy about update!

Why has it become necessary for me to enter my email and a password? I am a current spine surgery patient and I have used this app for years and Ive been very happy with it till now that is!
Suddenly Im locked out and I believe any reputable company would at the very least supply an explanation I realize I might be doing something wrong but as long as youre not going to respond I have to assume Im 100% right and you have now decided to disregard loyal users in favor of a dollar or two. It seems this is the current trend so youre not alone but thats no excuse.
I have several email addresses and dont recall which was used for this app as a matter fact I dont recall ever using an email address or password for this app, now I cant use it all, Please provide instructions for me to get access to this app again. So I can restore my five star rating.

donald-t about Spine Decide