Jasmine Othman Albi needs a ultrasound

Hello...we are in need of help, we have spent all the savings we had on trying to figure out what is wrong with him and treating his allergies, that was a long road of Dr's, ER visit, meds, blood work, xrays (and also one follow up one where we had to have a radiologist read the xrays) and follow ups. Turns on my fubaby has bronchitis from severe allergies. He has been breathing heavy, (going into the 3rd week now) and it is only seeming to get worse. Despite the blood work and the radiologist said his heart is fine, the Doctor is now recommending that we get a cardio ultrasound. This is going to cost us to start (this is just the ultrasound nothing more) $330. We need to get it done sooner rather than later, as I watch him and every week it seems his breathing is more labored and fast. He is my world, I am disabled and he is more than just a companion. Any help would be much appreciated. Thank you!