I suggest you dont go to your psychologist...a marriage counselor is ideal and one you both havent seen before. Yes, it's a good idea and Relationships Australia is a good one.
Changing medication is a Dr/patient decision, we cant advise there sorry.
I suggest you both move your children back a little and begin to focus on your relationship. A picnic on a river bank, a night out, a movie, a cafe coffee, more time alone without your kids. This is the building of more foundation of your family, not ignoring your kids.
The old fashioned idea of dressing up in a new dress, haircut and holding hands is a start- things might fall into place then. Effort must come from you as he seems in no man land and his depression would contribute to that.
My wife and I go caravanning even for 2 nights, a bonfire, some sausages, salad, marshmellows and nature. Think about spicing up your lives. I dont know how old your children are but think about handing over some responsibility like turning the sausages while you both go for a 5 minute walk together- alone!
People can tend to blame others. This is where the counselor will help you both. A little sotry-
My ex GF for 10 years and I went to counseling. She was always outraged that I'd do my model airplane hobby till 1am to 2am before bed and never needed as much sleep as her. We went to counseling and she told the lady how outraged she gets about me doing my hobby. The lady asked her "So...do you have a passion"? The question stunned my GF. The answer was no. If she didnt have a passion then how could she relate to me having one? Indeed the lady asked- "If he cannot sleep, why is it an issue for you"? Such short questions that made all the difference.
I didnt leave unscathed and was also at fault in some areas. Counseling is good. I hope you pursue it. There is also a thread I wrote about arguments-
Beyondblue topic relationship strife- the peace pipe