H.W.
Please do as suggested and get help for your entire family.
I know you are trying your best. Your description of your exchange with your son sounds fraught with struggles though. Negative scripting (asking him "don't do" instead of giving him a positive "To Do"), kicking him out of the cooking instead of first trying to ask him to clean up the mess, the power struggle within the moment and the fact that you were so emotionally upset that you were shaking-- all of this, from an objective standpoint, feels somewhat extreme to me.
Your description of your depression is also a sign that something isn't right at home. Not being able to get out of bed sounds like clinical depression to me. You need to figure out what's going to help *You* have balance in your life before you can try to help your son find that balance.
It sounds like the therapist had some concrete advice with the family therapy. I'm not judging you, and I also know from direct experience that bipolar disorder can be very difficult for the entire family of origin, no matter *who* suffers from it. I also feel like you might consider what sort of questions you ask your son about yourself, because that can be emotionally loaded for children. They can barely answer "why" questions about themselves even in their teens, so I'm not sure asking a 5 year old to clarify between you feeling sad/mad is the tack I'd take. This *would* be a good question to raise in family counseling, where everyone would have some support, but it's a big scary one to a little kid his age.
I hope you find the health and help you so desire. I have watched one of my sisters and her daughter both struggle with bipolar disorder and it's a long, long process. (So I understand your son's therapists assertions.) I also have an aunt with the same, and it's been a long hard road there as well. The aunt is a cautionary tale at her best; my sister and niece are more hopeful. Therapy sucks, sometimes, I know it. It's hard stuff and just a killer some days. But, there is hope if we are brave enough to face the hard stuff and just *do* it.