Sounds like he still has some work to do on his own with the T. His taking a time out was a good thing but he still has some control issues. Don't let his need to have you back by a certain date intimate you. I agree with the T, that not setting dates would be a good thing. He might not like having an uncertain time but it is what it is. Tell him you can't give a date because changing behavior ( both of you, him becoming more flexible and you becoming stronger) takes time. It's like a painting.

First you need to get the canvas and tools, build it, make the paints and wait for the oils to dry inbetween each session and all of that gets complicated by real life, like supplies being available, humidity and health. Not all of it is in the painters control, if you have patience the painting will be beautiful but you can't rush it.

Your marriage has the frame and canvas but you had to take off the paint and start over, it can't be rushed. Listen to your T, I think she's wise.