Like you, I have a deep fear of vomiting. I was anorexic from the age of 5

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IBS made me suicidal. The constant bloating, my digestive system had slowed down completely ..........
I have been treated with appropriate medication since 1988. Do you have a local
MIND Charity walk-in Centre, I found one close to where I live by doing a google. I sent an e-mail about opening hours and I had great support for several weeks.
You are un-likely to be 'sectioned' 4 discussing your feelings and fears with a GP. Regardless of whether depression and anxiety are caused by feelings or are hormonally generated, if you are feeling as ill as this, you need to have appropriate treatment. You may find that your NHS area has a dedicated Psychiatric Nurse who can visit you at home.
Yes. Your local Priest, Vicar etc. should provide Pastoral Care. He/she will be used to people talking about all kinds of issues.
I never wanted to die, but to sleep until the pain went away. For me, depression is mental and physical.
Let us know what you decide and how you get on! Also, with the weekend approaching, do speak to someone either this evening or tomorrow. Your GP should be your first port of call, "Please can you talk to me about options to help me feel less suicidal" might be your opener - a GP should make time to either talk over the 'phone or call you to the Surgery. A&E is an option but sitting for ages might make you feel worse. If you have a local Mental Health Private Hospital, it may be worthwhile speaking with someone there.