OP I think I've read all your posts. I think that as you have had depression, used alcohol to manage it and now given up the alcohol then these are the things to addrress first.
Stress about your younger son's health or your dd's boy friend's frequent visits are all real things that you can address but you need to do this from a position of strength. You need to get yourself fighting fit.
SoCockneyItHurts " too am wondering if it's hormones.....I'm 43 so may be a tad early for menopause but cycle has become irregular plus I have underactive thyroid which can cause early menopause or could be peri-menopause? Whatever it is I'm not liking it so could be worth getting bloods checked. I'm erring more towards the fact that I'm just a miserable cow though lol!"
I have an underactive thyroid and started menopause in early 40s. In fact I think anything after 42 is not considered early, even though national average is around 50/51.
Please see the doctor and get something in place for you.
Then tackle issues around your dd and your ds's health. Talk to your dh and get him on side. Talk to your daughter, if she really does not like uni, could something change? Could she change course, could she change uni, could she stay at uni for now but start looking for a job instead? It may be appropriate just to be a listening ear, let her decide what is right and be supportive.
Once things have calmed down a bit you could address the issue of the boyfriend being there all the time. I agree it is an issue and you are not wrong to want some peace and quiet. However, I wonder if that issue needs to take a back seat while you address your own health and your daughter's mental health?
Totally agree with Maryz "Don't talk about this now; emotions are too high and things will be said (are being said!) that you will both regret.
Make time during the week, or next weekend when bf isn't around, and set up some ground rules - you, her, your dh.
Don't feel guilty; that's pointless. You are where you are now, you need to make plans for where you go from here..."