I'm sorry you are struggling so much with this. Could you maybe talk to your t over the phone at lease, and tell her you can't really come in sooner? I know when things get really overwhelming for me, even just a short phone call to my t has helped in the past, so make me feel less alone. There have been times when she offered to have me come in sooner, but I couldn't make it so we just talked on the phone and arranged for check-ins.
Also, have you guys talked about why you are going to couple's therapy? I know for my wife and myself, it was to work on communication (or so I thought) and it ended up also being that extra support for both of us. Maybe you could get something like that out of couple's therapy on top of whatever issues you guys are going into it with?
I hope you can find the support you need and get some relief from all this.