Anxiety about baby # 2

Mandy
Does anyone else get horrible anxiety? 
My son has Leukemia and it's been a nightmare. Thank God he's still with us today but he will be still getting chemo for 3 years. 
I'm freaking out... What if something happens to this baby, too? 
This is also brought on because a 17 year old was killed in my community this weekend and his brother also just died in July. Two tragedies to those poor parents!! 
How do you get past this anxiety?