I have used probiotics for years but found that goat's milk yogurt works for me so I rarely use them. Many people are allergic to cow's milk so if you have allergies it's best to avoid it. I am making my yogurt - its easy and lots of instructions online. The last probiotic I used had 9 healthful bacteria.
Over eating is often a symptom of a disorder such as malnutrition even though you may be overweight. Candida actually cause us to feel hungry.
One cause of leaky gut syndrome is caused by gluten in wheat, barley and rye. You might be interested in looking at the information at Celiac.com.