Husband being deceitful.

I have busted my husband lying again about drinking. I found all the bottles he has stashed. I've also finally got him to admit that he is sneaky rum while he is at work. The fact he lies so easily to be is what is killing me. I feel so betrayed that he lies so easily about it. He has massive health issues and I've missed massive chunks of my babies growing up including the newborn stage because he got that sick that rather than being able to focus on our newborn I had to focus on his health my kids are my absolute world and he knows it killed me to miss that part of their life. The drs have told him to cut back or stop drinking and yet he just continues. I'm considering a trial separation to see if the possibility of losing us would be enough to get him to see what it is doing to our family and I would be able to use this time to just focus on our little ones. I used to be scared to do this on my own but now I'm at the point where I think it's not fair on us to have him act so selfishly. He was diagnosed with ptsd after how sick he got but he knows he has a problem but just ignores it and takes his moods out on us. Not physically just everyone is walking on egg shells to not set off his bad mood. This is part a rant and part asking for advice am I being too sensitive or is this a real issue that I should take a stand about. I know sometimes when in a situation our judgement cab be clouded by all the responsibilities that over. Also my older child has started lying too. I don't know if it's part of his age development or is he learning this trait from his Dad?