I really hope that therapy helps you sort out where your issues are and how best to address them. I am glad you are getting that help--expect it to take time and not to have answers in only one week.
I want to point out (and, obviously I do not know how much is perception and how much is reality or what kind of look you received, etc), but since you accidentally posted from your phone, I was able to look at some of your more recent prior threads--and only a few months ago you described YOURself as a "control freak" Don't discount the possibility that there are control issues on both sides, especially since you also mentioned not getting along well with most of your family (which also might mean less support from them than you are hoping for?)
And, um, I mean this nicely, but just form what little I read it seems like you are used to a pretty well off lifestyle (you spent more on a 16th birthday party than I spent on my wedding

) which is FINE--but really think about what the culture shock of supporting yourself at what will likely be a much lower income level will feel like to you.
Also, reading your newest update and seeing that you have not spent a single night away from your husband in the 17 years you have been married--think about how you will feel being alone most nights. Your kids are getting older and will be out with their own friends, and off in their own lives soon. You need to be okay with being just you for a lot of the time if you do decide to dissolve this marriage.
BTW--I am not trying to say not to consider leaving; only that you really need to look at ALL the ramifications of doing so and make a really honest assessment of what it would entail and how you would be able to cope if you did. Make sure that you are not blaming your husband or your relationship for things that are really not the root issue and will really not be solved by ending that relationship, before you make any rash decisions and leave yourself worse off. Anything less wouldn't be fair to you, or your husband or your kids.