Bump on tummy 2nd post first one wouldn’t work

So I made a post earlier about my son having a umbilical hernia in his belly button at 4 months. That seemed to heal itself and then he got this other bump up higher in his tummy. My family doctor had us referred to a pedi and I seen them today. The pedi said that it would be very rare for that to be apart of a Hernia. I am not looking for a diagnosis but has anyone ever dealt with something sort of the same and had a good outcome. They are sending him for an ultrasound. She brought up a tumour or mass and my heart dropped I have been feeling so sick and stressed all night. Now I have to wait for an ultrasound. Otherwise my little guy is a healthy happy thriving boy. He’s 2 and he is a twin. In the womb he did have a small abdomen but nothing major. Please some one give me some good advice how to not worry about the worst. I am so stressed I don’t know how to handle this