I hope you can see that many people are concerned about you. Perhaps that compassion is some comfort?
The rest of my post is some advice, but please feel free to ignore it if it's not wanted.
You say you would consider treatment, but that you have two worries. 1) That they would detain you under section 2) that they would subject you to treatment against your will
1) Detention under section:
There's no chance you'll be detained under section of the mental health act unless you have a definite plan to die by suicide and you intend to act on it soon. And even then it probably wouldn't happen. Currently there just aren't enough beds available, for one thing.
The other reason is that most trusts should have moved to a "crisis resolution and home treatment team" model. These teams provide short term interventions and are specifically designed to keep people out of hospital - we know that hospital in-patient stays tend to make things worse, not better. You would do most of your work with a community treatment team with CRHTT help when needed.
2) Forced treatment:
Mental health treatment is very different today than it was 15 years ago. The Mental Capacity Act came in in 2005, so it wouldn't be possible for them to detain you under section and take out your womb (if you had one) today unless there were very unusual circumstances. Here's a case where a man who lacked capacity in some areas was deemed to have enough capacity to make a medical decision that resulted in his death: https://ukhumanrightsblog.com/2015/10/13/court-of-protection... That's a gruesome case but I hope it shows that forcing treatment only happens under certain circumstances. There are some powers under MCA and MHA to force medication, but those are not common.
Nationally less than 10% of people under secondary specialist MH care ever go inpatient. Something like 92% of people in secondary care get that care in the community - either at their home or by appointment in a clinic. It would be unusual to force someone outside hospital to take treatment. There are community treatment orders, but they tend to be a justice system thing and not a mental health system thing.
If you did decide that treatment would help you might want to look at the various guides to the Mental Health Act. (Mind do one; Rethink do one; the Government does a nice guide too.) Then:-
Make an advanced directive; work out who your "nearest relative"[1] is (and then change that to someone you trust, and make sure that person knows to always say "I object to the section" to the AMHP if anyone does ever talk about detention under section (although that's really unlikely)); then go see someone.
If you think a short form talking therapy would help you should be able to self refer, or you might need to get a referral from your GP to "IAPT" (Improving access to psychological therapies".
If you think you would benefit from long form therapy, well, those waiting lists are very long pretty much everywhere. Some places are maybe 6 weeks for assessment and then 18 weeks to start treatment. Other places are much longer. The sooner you start the referral process the sooner you'll get to see someone. You'd go via your GP, then probably to a gateway team. (Although this process varies across the country).
Or you could just go privately. That could be expensive (£30 to £50 per session is reasonable). But it gives you some more control. You might want to check professional registration - BACP is often recommended. I'd stll recommend the advance directive stuff and the nearest relative stuff.
[1] this is a person defined in law and they have some power, so it's important to have someone that you really trust.