Help dallas the dog get a vet help

I came home today and found my best friend of 11 years on the floor after having a seizure or a heart attack. This close to Payday and it being Sunday emergency vets are the only thing available trying to hold out till tomorrow to take him to his normal bit but still going to be low on funds. For y'all that know me know that Dallas has been with me for a long time and he's absolutely my best friend and a cool ass dog for those who met him. I'm about $100 short for the vet bill and medication asking for any and all help that anybody can give. I don't want to say he's passing away but I don't want to think about losing my best friend. Any help is greatly appreciated God bless you all and Dallas thanks you as well.