Step son health is getting worse

My step son is 18 and currently waiting for a kidney transplant. He's been in a lot of pain which is why he got a medical marijuana card because it helps with his pain. My husband has been stressed out because he seems to get worse and worse everyday. I take him to dialysis appointment. He's suffering from urinary incontinence and he's been getting more irritable. My husband had to take him to the hospital last night because he was swollen and having horrible chest pains and now his heart is bleeding. They're checking him for cancer and my husband stayed the night at the hospital. I have been trying to help but I feel like my husband is now snapping on me. It's like nothing I have done has been right. I'm trying to be supportive but he's just been really irritable with me. Worse than my step son