Hello Zita.
I read this heartfelt post a couple of times now, and can totally understand the dilemma you're living with day and night by the sound of it.
Trust me what you are going through is very normal, so don't worry that you are experiencing something that won't pass, because I know with all my years here seeing this time and time again, it will get better I promise. This anxiety lark is self perpetuating because you just know it's going to happen and because you wind yourself up worrying about that, it inevitable does happen.
You probably have a thousand things going on in your mind right now Zita, hence why you can't sleep, so throw them all away and only bring back and deal what's happening now and not what MIGHT happen tomorrow. Turn your attention back to your husband and children because they will be missing the old you, and you'll find with their love and affection back in your life, this will guide your thoughts to nicer places and will help with the anxiety big time.
Keep posting how it is,, we are all here for you on your journey I promise. :-)