your the mum so unless you have done something seriously wrong, the courts are more likely to go in your favour IMO. so dont worry about that. go get advice as has been suggested. i know its easy to sit and worry and then get in a state ( i do it often) go get the advice, find the facts then make informed decisions. go to a solicitor and tell your husband the information you have found out. maybe this will either frighten him to hi s senses. or allow you both to discuss the future.
at the moment i know your thinking about him and what he will do - HE might get custody, HE will re- marry. just you let him know - you will get custody. and you will re - marry too, he will have to financially support his kids.
let him know you wont crumble and die ( even if you want to)
thinking of you - e - mail me anytime [email protected]
husbands are shits arnt they!