my sick Beagle dog

I have a blonde beagle, she is 7 years old.  She is a very sweet girl and is very bonded to me, and I am bonded to her.   She was diagnosed with autoimmune disease.   She also has some type of tumor in her stomach. The last 4 months, I had to bring her to the vet to get her blood tested.  that alone was costing me almost $400.00 a month.  She now has a hard time walking.  I have been giving vitamins and whatever else I can find that might work.  it helps a little. but, she still has the tumor issue,  she is also blind now. not sure if the meds I got from the vet caused that.  I have another vet appointment tomorrow for her.  I am hoping they can get her back on track.  Most likely she will need further testing.  not sure of the cost.  .. ... I am low income, the vet charges go on my charge card. now I am having a hard time paying that.   I love my Lucy and don't want to lose her, nor do I want her to be in pain if she is. 

I have never asked anyone for money.  I don't like doing that, but,  don't want my Lucy to be in pain or die too soon.   

Also, what I heard is the autoimmune pills could make a dog or even a person go blind.  my neice has Auto immune disease. she gets eye injection (yuck) so she won't go blind.  I am not even sure if it will help Lucy at this point.  

thank you in advance, any donation will be greatly appreciated.
Pat Rask