I'm not an infectious disease doctor, but this sounds like an immune issue rather than a chemistry issue. Candida is everywhere. I don't buy into alkaline water for reasons I won't go into. Lets just say the amount of base required to change your entire body pH would kill you with sodium, and be buffered by acids.
I would concentrate on immune function. Get zinc and Vit D checked. Vitamin D is misnamed, its a fat compound and basically a hormone/signal not an enzyme or catalyst. Zinc is the basis of cellular immunity (this is based on my Biochemistry from 20 years ago so feel free to check my math). There is a whole family of proteins (nerd out here)
used in DNA and RNA transciption. This is critical for high turnover cells like the pink cells lining your inaards and immune cells. Those are easy fixes.
Then concentrate on the diet that fits your genetics. There are some testing companies that are advertising this, but I am not sure the science is very good yet. I would trust your sensation. Brain fog? Don't eat that. Bloating/gas? Not a normal thing, we aren't ruminants. Listen to your body.
I'm a paleo-ish diet person, and it is NOT low carb necessarily. If messed up sugar metabolism is an issue, I don't think sweet potato is a fix. That said regular potato gives me sleepyness, which maybe is from the beladonna- type stuff in them. Not sure. So I grow other stuff. Corn and rice I feel fine. But that is me- you have to do your own sleuthing. Cabbage gives me gas,unless fermented. So I ferment stuff and feel awesome! Milk lights me up but kefir is a great, no gas at all. Keep a list, simplify your recipes/diet to figure it out. I do restriction then reinitiation- no symptoms off some food then back to symptoms means its not for me.