save brownie let him be able to go to the vet

Hi i'm out of options and out of time. Meet Brownie he is a 14 year old chihuahua mix rescued from the animal shelter here in Florida. I adopted Brownie about 4 years ago when Brownie was 10 years old he was on his last week at the kill shelter and I couldn't see this wonderful old pup not be loved for the rest of his life. Brownie has had a rough life before we met and I have been doing my best to create a loving, carefree, and spoiled life for him. Currently Brownie is going through some pretty hard health issues. Started out with a few seizures every month, I took Brownie to the vet and they reassured me that they don't happen frequently enough to be a true health issue. I tried to prevent it at all costs making his food from scratch making sure everything going into the food was grade A from carrots, sweet potatoes, apples, blueberries, broccoli, rice, omega-3, and a meat protein with changing his diet completely he hasn't had a seizure since may woohoo! Couple months down the road and we are in December and they have started again but not like before.... so much worse in the course of 5 days started December 3, 2020 up until today December 7, 2020 Brownie has had 6 seizures that I have been present for. Due to covid-19 work has not been as great as it could be so upon other things  I am unable to cover the trip to the vet and the tests needed to be done to figure out this horrible traumatic event that has become a day to day occurrence. please Brownie is my partner and my rock that keeps me waking up every morning. Nothing would mean more to Brownie and I if you could help him. Brownie doesn't deserve this pain. I would be forever greatful if everyone could help save my baby. Please love and cheer happy holidays everyone!