This is an emergency and we can’t provide for you the care that he needs from the vet. They can get fluids in him via an IV.
I am so sorry, but I know with the emergency vet near us they let us make payments, you should call the vet and let them know you will have to make payments and hopefully they will let you. But you have to take him to the vet at this point.
If you have an air-conditioned car, you can try keep him cool for the moment, but if his gums are pale it means he is going into shock, and if he’s already too dehydrated, YOU HAVE TO GET VET CARE otherwise his life is at risk. I’m so sorry. I know that is not what you want to hear.
Once the vets get him back to normal, here are some tips to help keep him cool.
http://www.rabbit.org/faq/sections/…eat-stroke
https://binkybunny.com/BUNNYINFO…fault.aspx
I know it’s been REALLY hot in LA, and it’s been abnormally hot here too. It rarely gets into the 90’s like it has these last couple of days, so we don’t have air-conditioning, (except for this mini- window air-conditioner in the bedroom) but I keep a temp gage right where my bunnies are, and most of the cooling tips I follow especially the wet sheet with fan, ice water bottles, cool surface etc, and it has kept the temp at their level no higher than 78.