Im afraid of my husband dying.

Hes a perfectly healthy 20 something yearold with no poor health in his family history but im so terrified hes going to die. I lost my mom when i was 6 she died in front of me and my dad soon after he found me (my grandma hid me from him for 8 years) he commited suicide. I know thats where my anxiety stems from. And especially around the time of the year i lost my mom (which is in a couple of days) i cant sleep cant bear to be away from him when he sleeps i have to watch and check to make sure hes still alive. I work myself up thinking how badly it would be to lose him and never see him again and i regret every fight and second ive ever spent away from him. Ive talked to my therapist about it and nothing seems to help. I was wondering if any one else experiences anything like this?