Agoraphobia is caused by the over-producton of stress hormones which usually result if blood sugar levels are not properly controlled. When blood sugar level fluctuate the brain is not supplied with proper levels of biological energy, necessary in the production of feel-good neurotransmitters such as serotonin. I would suggest that you have a look at the Hypoglycemic Diet, which is similar to the diabetic diet to make sure your body receive the proper nutrients. When you have unstable blood sugar levels your body is under stress and may affect your immune system triggering all sorts of illnesses such as actinomycosis.
If problems persist I certainly suggest you consult a nutritional doctor or naturopath.
Taking large amounts of vitamin C can lead to other problems as well.
http://www.telegraph.co.uk/health/healthnews/9849917/High-dose-vitamin-C-doub...
12:58PM GMT 05 Feb 2013
They made their finding after looking at the incidence of kidney stones over 11 years in 23,355 men.
Those who took vitamin C supplements - which typically contain 1,000 milligrammes per tablet - were at twice the risk of developing the stones compared to men who took no vitamins.
Those who took the high-dose pills most regularly were at the highest risk.
But taking vitamin C as part of a multi-vitamin - which tend to contain much lower doses of the vitamin - did not raise the risk, found the researchers from the Karolinska Institute in Sweden.
Kidney stones are small crystals of waste matter that form and can block a part of the organ or the urinary tract, causing intense pain. They affect 10 to 20 per cent of men and three to five per cent of women.