Sarah, I am so sorry to hear about Tyler and I do know how you feel,

I have never owned a bird but I love birds and admire the people that know how to take care of them, I have allways had so many cats and thought it was creuel to torture a poor bird with so many cats around it, wishing it was their next dinner. I know their are some birds that get along fine with other speicies including cats but I think it is better to have them raised together and my cats at least a couple of them have been hunters all their lives, ( now 16 and 14 years old) and I know they could not be 'retrained" not to hunt.
Even if Tyler has had more than half his life be 'crappy" at least the time with you has brought him good memories and feelings of love. When one of my animals gets sick, I allwalys question why and am I doing something wrong, and worse yet, I hate the idea of letting them go. It is allways a personal decision and from what I have learned over the past few years in particular is that no self respecting vet will just put an animal"down" unless they really feel their quality of life is very bad or poor, because it goes against everything they have been taught. Vets are trained to save lives at all possible cost, and will not put a healthy or animal that has a good chance to sleep just because of cost or owner request.
If Tyler's problem is getting really severe and his outlook is limited, then the vet will consult with other avian experts or vets in that field for more advice. Mayby Tyler is just tired out in his physical body and wants a rest, then again, mayby he just needs another dr. to give him something he did not get before. Each case is different and nobody but you , Tyler and your Vet can make that call. The fact that birds like him can live a long long time is postive, but just like humans, why do some of us live to be 90 or more, and others of us have short lives that are full of pain , or we die at a very early age?
All I can say is that I am sending well wishes for both of you and esp that Tyler is as pain free as possible to go through whatever he has to go through and that his recovery if deemed so is quick and complication free.

:hhug:It also seems strange that our loved ones, animals of any species as well as ourselves allways seem to have "emergencies" after regular hours and on the weekends!

That I still find strange and must be connected to a built in internal clock that says, reach in your pocketbook, cause it is time for stress, stress stress.It is like our early ancestors who go out to gather some berries or roots, and meet a Saber Tooth Cat on the Way, the "flight or Fight response" kicks in and in my case it would be flight, run run or get eaten. today we do not have the Saber Tooth Cat, just everything else to stress us out to the max! Good Luck, know you are a good mom to Tyler, and I am thinking of you both. Just go with your gut feelings on what to do, and then why not ask Tyler...he will give you the answer. :

RWM