Oh poor Joey..well you can add Izzy to the list of million dollar babies..lol.  
 
Trust me the people who have responded to your thread have been through it all as well and spent a fortune.  Izzy was diagnosed with pancreatitis last November and she wasn't even 2 with no signs except being tired and not eating and when she threw up once that morning and it was brown I knew something was wrong.   
Since November we almost lost Izzy 4 times and spent a fortune like the rest of these wonderful ladies on here.  But persistance is the key and reading and asking questions of your vet and working together with him will make a huge difference.   
I, too, feed Izzy a wonderful diet and she still got sick.  I had to bite the bullet to save her and use the S/D W/D and now Purina EN.  I am just now slowly adding better food to her diet after talking with a pet nutrionist and doing my own research and talking with people on YT.   
Izzy is also on enzymes, probiotic and Vitamineral green.  She is also on Tylan and Pepcid AC daily.   
I know it's frustrating in the beginning and  you do a lot of crying and money spending but don't give up..you can find an answer for your baby that works and we are now going on 5 months without an issue..to us that's a huge milestone.  I didn't give up on my baby and she hasn't given up on me..you see we have a deal that she has to live to be 15 years old.

 
Keep us posted.