Hello. There is a lot of posted info. on this topic. Have not read it all. So I may be repeating what has already been mentioned. Go to the Music Book site Sheet Music Plus - World's Largest Selection of Sheet Music . There you will find several or more condensed books that will help you rebuild your basic playing.
The first one for embouchure correcting and building is the; Carmine Caruso book. When you play that first simple Blow/Tongue exercise. That is where' your best natural mouthpiece set up' is probably going to be for you. P.S. (Carmine Caruso was a Saxaphone Player that helped heal broken embouchures of Pro. Trumpet players etc.).
The other books are the condensed, First Arban/Second Arban/First Clark Studies; by Carl Fisher. The first and second Rubank studies. Can not remember author's name. But it is titled,embouchure building exrcises. A mostly red cover front page book.
This may sound silly to you. Playing back through; the book1/ book 2/book3 band books; by Essential Elements 2000/Best in Class/ and Standard of Excellence can be a great help.
Due your Caruso/ long tones/ embouchure book in one practice section. Do not rush the Caruso book. Work through your band books and other mentioned above books in evening second practice. Rest between exercises. A Pro- Trumpet player I know by the name of Randy Shell. Played for Walt Disney in his younger days. To get in extra practice time. When watching T.V. He does various exercises/long tones etc. during the TV commercials.
Alternate days on Band books and the Arban/Clark books. Always warm up with that first simple Carmine Caruso Blow/Tongue exercise. The Days your chops and body feel to tired, just play the band1 books.
At Sixty years old,My professional Muscian/Music Tech. told me, I picked a tough instrument to make a come back on;after 35 years away from the Trumpet. I to thought about the Saxaphone or quitting. It would not be any easier starting from scratch on a Sax. There is a lot more maintance and cost to keep a Saxaphone in good working order.
My N.A.P.B.I.R.T. Music Tech. does not get a great thrill out of working on Saxaphones and charges accordingly.
The one thing that helped me the most due to my age. Was dropping down to Harmony Second/Third/ part playing in my Church Essembly. This took a lot of pressure off me and lets me enjoy playing again. I let the young ones do all the red face/eye poping/neck swelling/high note playing.HaHa
Do not quit,just go back to your basics and slowly work your way back up with more softer playing and using faster EEEEE air on the higher note.
One more thing you might wish to look at. On the Stork Mouthpiece site. There is a picture Mouthpiece rim size to lip types sizing chart. Check it out and see if you are in your over all best rim playing size. Good luck