Overly stressed out over something bad happening to my baby?

I know that miscarriages, stillbirths, & SIDS are common fears among many first time mothers but my fear of these things feels so strong that it's been causing me to have high levels of anxiety and stress throughout my pregnancy(I'm currently 26 weeks). I'm afraid that my level of stress over loosing my baby is unhealthy, most nights I can barely sleep thinking about it. I get very emotional thinking about it. The feelings that I feel inside feel so intense as if these things have happened to me which is rather strange to me because I never experienced any of these things and my pregnancy has been healthy so far but the thought of losing my baby breaks me I can't even imagine going through it and the thought of going through something like that is causing me so much stress and anxiety. I think I feel so strongly connected to my baby and the thought of losing my baby haunts me because before I got pregnant I was very close to committing suicide I had about 4 or 5 suicide plans layed out in my head I was extremely depressed and suicidal and considering hospitalization. When I found out I was pregnant those feelings didn't necassirly go away but being pregnant has prevented me from killing myself because of my mentality towards having children and being pregnant with my child and how much I personally value the life of my baby. Being pregnant has made me want to continue to fight for my life because I feel I have something to live for and the thought of losing that hurts me so bad. Anyways I just kind of wanted a little support and also wanted to ask if you guys think it would be good if I talk to my doctor about my stress and anxiety because I'm afraid it will or is hurting my health.