Good morning all!
YY, my heart goes out to you Tinkobell , TheLuckyMrsPine Tarrara Neversaygoodbye and all other Po Ts of adolescents who are depressed, self-harming or suicidal. You must be in such constant agonies of worry and yet you write with such clarity and eloquence and are able to offer one another great advice to one another even while being put through the mill yourselves.
This Young Minds advice page mentions fwiw what I thought was a good tip; sending your teen a text or an e-mail if you are finding it difficult getting through to them face to face or when they have shut down. It also has a link to "advice for parents" which urges getting support for yourself (which would be even more helpful if gps practices had proper availability and mh services were up to scratch!).
Neversaygoodbye I don't have any experience of lying in that context but it must be very hard having to sit there and hope that the therapist is helping without knowing for sure. It's not at all easy but you are still there sitting and hoping and she will know that and feel more secure for it.
MrsPine you are not remotely selfish. These issues are all-consuming, I find much lesser ones so!
Tarrara I hope the acupuncture proves helpful
Tinkobell I hope you are ok and great that a friend was able to offer support. I hope your talk with your dd went ok last night too. Fwiw, I think that sounds like a good tactic to ease off on the academics.
IamHyouweegobshite I'm sorry your son is so upset
It might be hypocritical of me to offer advice because I am like your dh - ie the one who is constantly in conflict with my dd - but have you considered family counselling maybe? I think McMen's suggestion of getting his dad and him to go off together and spend quality time - just leave them to it - because dd and I get on a lot better (well, most of the time!) when we are left together and dh is travelling.
Historysock Xerox and Machinebee I am very grateful to you all re: the choring advice!
Historysock enjoy the dog walks! Many of us on here do the same to combat stress, so much so now that I tend to look at women out dog-walking who are roughly the same age as me and think "I wonder if they have troubling teens?" 
Xerox that's so true what you say about the psychological battle. And YY picking up after yourself is an essential bit of of the adulthood they are craving/rushing towards. Funny they don't practice that more eh!
But the bit about them being "super attuned" to any perceived sign of "neglect" is so true. My dd perceives a polite request to pass the salt as an "unreasonable personal attack" atm fhs! I think you are heroic to be talking about random acts of kindness at this point but I know you are right about it. I am going to have to try harder.
Machinebee can't thank you enough for that "blue print'! I am going to ruddy well follow it - word for word - starting today! 
Vigorous waves to all Po Ts! Hang in there everyone!