Help Duke beat Heartworms

Duke is a loving 8yr old lab mix.

About 4 years ago I thought i gave him to a good home, but they just left him tied up outside, and thankfully reached out to me they couldnt keep Duke bc he keeps running away n their other dog got hit by a car following him. 

I tried to rehome him with no luck as he seemed very anxious, apathetic & aggressive towards dogs who jumped on him (hes in pain). I thought he was just stressed but in reality he has been living with worms inside him, slowly killing him. 

Duke has heartworms at a very progressed stage, and also hookworms. He has pigment in his eyes, and trouble jumping up into the car.  He has trouble breathing and is very noticable. I could hear him panthing last night and he was just laying there. Hes got all his shots now, and has been dewormed for hookworms. But Heartworms is a different monster. 

Imagine chemotheraphy. Well thats what it is, and its expensive! And if not done ASAP Duke will not make it. 
And I need help. From anything as simple as watching him so hes not alone while going treatment as he was to be in complete bed rest. To donating any bit of money to his medical funds. Heartworm treatment is $500-600, plus bloodwork, medications, xrays, stay in the vet for a 61lb dog is $55/night. It just keep going up, their estimate went from low of $800 to high of $1000. 

And if you cant do either of those things, then I ask you to pray for him. Hes an amazing dog that was once full of life, and now hes barely even walking around. I know he can make it, and he will!!!! 

You can also donate directly to Kindness animal hospital, and make sure you let me know if you do that. 

Im currently looking for a place to live where I can keep Duke and give him a good loving home where he will never be tied up to a tree. 

thanks