Hi Heather
You situation is bringing back some memories for me. I remember it being quite awkward when H moved back home. So don't let that phase you. But you are correct (I think) that the arrangements should be different now. This is the start of a New relationship, not the Old.
I specifically remember my H asking me "Do you want me to sleep on the couch?" when we first reconciled. It seemed weird to me because I expected him in my bed (and that's where he slept). But we Communicated. I don't see you and your H doing that at all (other than the emails).
You need to get that hashed out ASAP before you both slip back into old habits. I like Nops one month plan but I think I'd step it up even quicker. Not that you will have everything worked out by any means but you need to start a good foundation: commmunication, living arangements, etc. If you are unhappy with the bed arangements YOU need to speak up. Don't expect him to do it.
I can tell you are losing it and I don't blame you but you need to establish some boudaries here and stick with it. I sort of get the sense the two of you have never really been vulnerable with each other but you need to start. Tell him how you feel about sleeping separate and do it Nicely. No accusations, yelling, etc. But you need to do it.