Sorry to hear about this unpleasant situation. Yes, it's wise of you not to embark on a second child at this stage, before the situation has come back under control.
I am wondering what form of psychotherapy / counselling your "therapist" is providing. Some still provide old-fashioned analytical type therapy, which still lacks convincing evidence of being useful. On the other hand, modern evidence-based therapies like CBT ( Cognitive-Behaviour Therapy ) have been shown to be really useful in helping you regain control of depression, anxiety and a wide range of symptoms.
I'm not sure of the dietary advice you mention, and a second opinion might be useful : while various dietary factors may relate to digestive and GI problems, they rarely contribute to depression or anxiety disorders. I've never understood why anyone would caution about carbonated / fizzy drinks : fizz is wholly harmless. Sugary fizzy drinks can be a problem, related to the sugar, but not the fizz.
It's often useful, when such situations seem to be getting out of control, or at least not coming under control, to consider getting an independent second opinion and re-assessment. You describe many different unpleasant symptoms, but many sound likely to be associated with anxiety disorders, and more likely to come under control with modern treatments for such disorders. A problem can be that anxiety can cause such a variety of symptoms that it's easy to chase off in different directions if one explores each as if they were independent problems ; and as one grows understandably anxious about this whole process, this can worsen the underlying anxiety.
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