TTC but anxiety causing me to doubt

My husband and I have a 3 year old (August 2016). We miscarried in August of 2019 at 8 weeks and tried again for a couple of months but we stopped trying because my anxiety has been soooo bad. I am constantly worrying I have some terminal illness (all of this started after the mc because I convinced myself something has to be wrong with me for having at mc). My husband is so ready to try and our little guy is ready to be a brother, but I am so scared of having another baby and getting some diagnosis that takes me away from them and they don’t have a mama. I’m at a loss for what to do. Don’t know if I should try, I’ll be an anxious wreck... but don’t want to put my life on hold for fears that are unfounded... and obviously anything is possible at any point. Ugh... advice?!