Re: Anyone know what the hell this is??

 Is it going to be a problem when the body's histamine release is "turned off"? AKA, chronic use of antihistamines (either natural or RX)

I imagine that even though histamine release is the culprit for the inflammation and the terrible symptoms, the body does this in a way of protecting the itself. I read that in leaky gut, there is a constant release of histamine, which causes the leaky gut to leaky even more, but the reason why it does this is because the body uses histamine as a response to foreign particles in the blood. (correct me if I am wrong here)

Histamine is generated during allergic reactions, and the body does use histamine for several reasons including stomach acid production.  But one capsule of quercetin is not going to counter all the histamine production.  It will help control excessive levels though.

I understand that until the fungal/yeast overgrowth goes away, the gut will always be inflammed but I need to start somewhere and cut the vicious cycle. If cutting histamine release can help repair the lining and bring up the SIgA, that'd be very good thing. My fecal SIgA was 3 .. on a range of 14-50 or so. severely depressed and damaged gut lining.

Candida will always be present, it is a natural part of the body.  It is the overgrowth, especially the aggressive fungal form that is an issue.  A lack of flora leads to a loss of acids that keep the Candida under control.  As the terrain turns more alkaline the alkalinity leads to the Candida growth gene turning on and the Candida converting to its more aggressive fungal form.  In this fungal form the Candida develop finger-like projections called hyphae that allow the Candida to dig in to the tissues and cause damage.  This is why I always emphasize prebiotics and/or probiotics to help maintain the acidity that controls the Candida.

I also thought about smooth herbs like slippery elm or DGL but i figure since those "coat" the gut, it might create a barrier on the yeast from the antifungals.

DGL is not a mucilage like slippery elm.  it is simply licorice root with the steroidal component removed.  With inflammatory conditions though you need that steroidal component.  So licorice root itself is recommended with mucilages such as slippery elm or marshmallow root.

Side effects I have found (small amount of reviews) were itchy skin. I will have to try it but I am not expecting much. Theoretically it makes sense but vitamin C is also supposed to be an antihistamine and doesn't done anything for me at a gram dose. Had 3 IV vitamin C had 20 grams but really dont remember much help.

I personally would not consider vitamin C an anti-inflammatory.  Some bioflavonoids, such as quercetin, often combined with synthetic C and found in conjunction with natural vitamin C sources are anti-inflammatory.