Hcm Cardiomyopathy Please Help

Hi everyone, I am new here. I have a 2 1/2 year old Sphynx baby named Pharo who was just diagnosed with Hypertrophic Cardiomyopathy HCM (heart disease). The last few days I have noticed him coughing. I wasn't sure if it was a cough or a choke. Of course, it can't be a hairball because my baby is hairless. I had also noticed he was breathing heavier than normal. I decided to take him to the vet yesterday to see if it was allergies, or asthma or something. Unfortunately, it turned out to be devastating. They took an x-ray of his chest and found that his heart was enlarged and that there was fluid in his lungs. In other words my precious baby was in conjunctive heart failure. The vet sent us over to an emergency center that had a cardiologist on site. They did an ultra sound and found that he had HCM. This means the walls of his heart are severely thickened. I am totally devastated. They told me that is prognosis is poor. They did manage to get him out of failure and he came home today. I have to give him a dieretic 3 times a day to keep the fluid down. They also said his heart went down to a better size after overnight care and oxygen. They said that he could form a clot and I could possibly see him become paralysed in the hind legs or he could just die of a heart attack. My husband and I have been crying constantly. I feel so empty inside. Can someone please help me deal with this? I love this kitty more than anything and it kills me to know that he could be here for 4 hours or 4 months, noone knows. I just want to try to give him all the love I can, but I feel hopeless. I can't believe my poor baby is going through this and he hasn't even had a chance to live. Please help.