Sophie, This is the first round of negotiations. They will posture and attempt to get everything they want and this is where the dollars add up in legal fees. His lawyers is going for everything the first time around and, of course, your lawyer is doing the counter. It's typical in most cases.
I'm going to give you this advice....don't phone your lawyer unless you absolutely have to. It's costs each and every time you call, letters he prepares, etc. Document, keep good records and take them with you when you meet with him. Make a list of questions. In other words, do your homework and be prepared when you meet with him, i.e., get more legal advice in one sitting and usually you are there about an hour, for your dollar.
As for your h, he's testing the waters to see if you got the papers and I bet he's not been advised yet that your lawyer has responded. They are very nice and when they do something unkind, they disappear. Typical bad child behavior.
Do not discuss anything w/him except your children and what's going on w/your living expenses at this time. Allow the lawyers do to the talking since the posturing has begun.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.