Your current symptoms may be related to things going on in the present. In any case, your choices are medication, therapy or learning how to handle anxiety on your own. I don't know what knowledge you have of relaxation techniques, what diet you should be following, etc.
I have issues from childhood, young adult, adult and present ones. I hardly ever know where my anxiety is coming from. Like you, I've gone over it with therapists and I continue to do so. I've been told I'm probably just one of those people prone to anxiety and I may have it the rest of my life. It's something I have to accept.
Lastly, I examine my body for things out of the ordinary. It doesn't frighten me. If I find something I go to the doctor. Many conditions can be cured if caught early. I never google symptoms. I have a medical book I look things up in but I know to stay rational and follow up with a doctor.
You sound like you need help. You need either medication and/or a therapist. Something is going on to affect your days. Get some help so you don't have to live like this. You are worth more than substandard days!
Generalized Anxiety Disorder
60 mg. Prozac, Ativan as needed.
"Nothing makes us so lonely as our secrets." Paul Tournier