Hi, I’m sorry to hear that you are having such a stressful time with your problem. Have you investigated food intolerances? These are completely different to food allergy and are most effectively tested by trying a food elimination diet.
IBS- Constipation- if you have ruled out all types of other intolerance you might have IBS- IBS can be helped by using the Low fodmaps diet by Sue Sheppard- she has a very good book with recipes and the book tells you all about the diet (the food intolerance management plan) http://shepherdworks.com.au/shop/food-intolerance-management-plan
The low fodmaps diet can also be used for most of the intolerances above.
Since you are already on the candida diet you probably aren’t eating anything with wheat in, but double check in case.
If you have a really good doctor then they will hopefully mention the fodmap diet. Please consider using it before taking pills that might have bad side effects, that you can only take for a limited time period because although they might help you at the moment once they are gone the constipation might return. Other helps for IBS are having hypnotherapy. Taking probiotics.
Also consider counselling if you are feeling depressed and down. At my old uni there was a free well being centre with trained councellors, check if you have one too at your graduate school?
If you want to check for a food intolerance the most valuable thing that you can do is to start a food diary. This may be difficult to do well at the moment because you’re on the candida diet, so you may want to investigate this after the diet to find out what is troubling you.
An elimination diet involves choosing one of the food groups you want to test such as lactose, exclude all foods with lactose in it. Record in your diary how you feel each day, then after 4 weeks try a mouthful of something with lactose if it troubles you then this may be the problem. If not, then try one of the other food intolerances.
Even if you think a food intolerance is the problem be aware that candida could still be the problem as well. I initially went on the candida diet and found that my diarrhoea was getting worse and worse over the three months I was on it. I stopped the diet and investigated eventually working out that I had fructose malabsorption. I found that eating lots of onions and garlic (good for fighting candida) was exactly what my body did not want. So I stopped eating foods with fructose, which led to no more diarrhoea, but I still had other problems so I am now back on the candida diet.