Really though, seek help. It is unlikely you'd lose choices (eg be sectioned) if you're asking for help and engaging with that help.
I pick at this stuff in my own head all the time, and just don't have enough confidence in doctors to believe they could tell me anything new. Being able to skip straight to pharmaceutical or other non-talking solutions via a disclaimer would probably mean a lot more people like me would seek help.
Antidepressants are strong stuff. Some years ago I hit a bit of a snag and went to a doctor and got just this, a prescription after five minutes of talking with helpful advice like "get a girlfriend" or "study something else". Stuff really worked... except in the wrong direction. Not an exception either, common enough they put "suicide" as a side effect in the fine print. I think if you're gonna take something like that you need some kind of feedback/monitoring and test different drugs until you might find something that works right. A hands off fire and forget prescription like I got likely won't work for most people.
GPs have been enormously helpful to me with this stuff. Most are very understanding. If you can do an online appointment booking that might help too - so the immediacy isn't an issue so you can write the appointment reason very clearly and revise it as much as you want before hitting the button. Otherwise, tell the receptionist you'd like a phone appointment (for the distance that gives psychologically) and that it is for a mental health issue. The diagnostic criteria for depression are fairly easy to satisfy - it is mostly about low mood for 4+ weeks. Keep details to a minimum you need to get a prescription but be cooperative if they probe.
Whatever you do though, don't just suffer. Tell your spouse how you feel too. Get some help.