Do i need to speak to someone

I am 20 and a mother of two beautiful children daughter aged 2 and my son 9 months. I have a amazing partner who I been with for five years but there's one problem that I have been hiding for so long because I don't want people to think I'm unstable.

Every night I go and lay down all I think about is what if someone breaks in and steals my kids.. I almost have panic attacks and need to double check windows and doors :( I get scared dropping my daughter off at daycare, I think about how I would feel if something happends to her or my son and I freak out :(

what is happening with me, right now my heart rate is through the roof! please help