Hello everyone , I wrote out a long post in the early hrs but it's gone AWOL.
Welcome to all newcomers!
Jaxon I see you have withdrawn your posts overnight so I won't repeat the two
points I was going to make but I hope you are ok 
Staywithmemyblood 
I looked up the poet and its Henry Wadsworth Longfellow not Belloc. Must admit I am familiar with a second verse that is not quite as optimistic as your version!
Aramox I'm no expert by any means but if he is testing your boundaries he probably wants you to stand firm at some point along the way so don't be afraid to change the WiFi password. Trouble is, this will also probably mean that he will go round to a friend's and use it there but it will still be an inconvenience. I'm not convinced consequences work as well with teens as they do with younger dc anyway , they often don't work with some adults eg repeated parking or speeding tickets. And he's right that you can't make him do things he doesn't want to. I think it's more about your relationship at this age. The only thing that seems to work with DD (after a period of reflection from her that usually takes longer than is optimal!!) is expressing disappointment, and withdrawing emotionally. Not in a manipulative way but just not engaging with her as normal, getting on with my own stuff and being a bit "cold", so she knows that if she wants to engage with me, she has to come and have a proper conversation and apologise and talk sensibly about what has happened. And try and improve a bit on whatever is contentious and work on a bit of give and take. Doesn't often work. She will often do exactly the same thing 15 mins later and with spectacular rudeness, but hopefully over a much longer time-spqn, the message will get through. This endless merry-go-round is very wearing though.
Ghogday you are definitely not alone! I keep wittering on, on these threads, about a book called "Untangled" by Lisa Damour. It's about bringing up teen girls and contains a useful reference on how to tell when something is a mh issue and something is most likely "normal" teenage angst. I personally found it v helpful. At least I think that section is in that particular book, I have so many of them, will check! It's very helpful in other ways too though. Hope the counselling helps.
Gingerfreckles sorry you are going through such horrible stress; you sound exhausted . Obviously, I don't know your circumstances (and absolutely no need to explain further here) but are you sure you can't get away, even for a night or two? You sound as though you desperately need a break and there is the old cliché of not being able to keep paying out when the bank is empty and all of that. If you don't give him much notice, so he can't get anxious, and couch it in terms of going to do a specific errand or visiting a relative in need maybe? If not soon, I hope you are able to arrange some respite or support before too long.
Hang in there everyone! Hope all PoTs have as relaxing weekend as humanly possible in current circs.
It's half-term here next week. Feel like slobbing out as it's been full on here, but we have yet more visitors. Hoping DD will be cooperative... it's touch and go currently ... .
Hope