Help! What am I feeling?

So I have a work to do abroad and I have to leave my family and baby boy (aged 3 months) for 3 days.

I don't know why but I think I might have separation anxiety.

I keep on thinking something is going to happen on the plane. Or something is going to happen to my family back home.

What is this. Why am I feeling like this??? I've never felt like this before and I have been on countless plane rides :(

Help.