My husband is having severe panic attacks!!!! HELP!!!

I am 33 weeks pregnant and my husband is having severe panic attacks ever since he has heard a close family friend suffered from a heart attack!!! I can't take him anymore I am trying to be a supportive as I can but it's getting really hard. I want to enjoy these last few months of pregnancy but he is making it difficult. He constantly checking his heart rate on his Apple Watch. It's bouncing from 75 to 110 every number in between while he is just laying on the couch. He checks it every second. I sent him to the doctor Monday and he has a sinus infection and his blood pressure was 130/20 and the ekg came back fine and he was put on antibiotics and a small dosage of lexapro to calm his anxiety. He is still freaking out!!! Please help me what can I do????