Tiffany,
I understand money situations, but he NEEDS to be treated by a vet. It sounds like it's already an advanced lower RI. The longer it takes for him to get treated, the more scarring that his lungs are going to get, and yes, possibly even death.
I'm not trying to scare you, but give you a reality check.
I don't know of anything over the counter that you can give him - oral medications are not metabolized in reptiles as they are in mammals. So any medication should be administered by a shot.
Doseages would also need to be determined by a veterinarian to ensure that the doseage isn't harmful to the animal.
I thought you said your mom agreed to help out with the vet bills?
It sounds like your animal is in distress. Raising the heat will help, but without treatment, I'm very concerned about your KS.