Hi CeCe,  I joined just so I could respond to a post of yours from years (?) ago that I ran across in my searches.  Some thoughts on your food problems:
-Betaine must have pectin in it, only with food, google it with "mistakes."
-avocados are high histamine.
-I personally can't handle any protein, perhaps your problems with eggs, etc.  I also recently found out I'm allergic to eggs, carrots, grapes, cantaloupe, pineapple, etc.; you might try getting tested for food allergies.  Also, realize that my allergies/histamine intolerances mean I can't have muffins unless vegan (eggs), fish oil (fish protein), digestive enzymes with amylase coming from pineapple (also bromain is pineapple, probably stay away from papain, too); many juices (grapes), etc.  It's important to check the fillers, even the individual ingredients.
-my histamine intolerance became horrific when I went off an antidepressant (turns out they act as antihistamines).  I could barely eat anything, I tried raw vegetables, happily munching on wedges of raw cabbage.  It worked OK for a while, then constipation.  Then I read that despite the hype, our guts weren't meant for all that raw roughage, it tears us up.  Now I steam EVERYTHING & it's made a big difference, you don't have to steam them to death, keep them alive.  The water underneath is great for drinking, too.  Also, be aware of individual foods, I added two leaves of chard to my steamed onions & had a big reaction, apparently chard is high histamine. 
-You can google lists, but they vary & we're each different.  No raspberries, strawberries, etc.  Google histamine intolerance & you'll find lists.
-some probiotics are for constipation, some for diahrrea.  For histamine problems, some are really bad, all I can remember at the moment is casei.  Some good ones are b. infantis (Align - tried it once, not sure about it), longum, plantarum, you can google with "histamine," or "constipation/diahrrea," whatever your problem is.
-I don't know how you all eat raw meat.  I loved raw beef when I was young (30 yrs ago), but I wouldn't trust anything now, unless perhaps I bought it at the farm which isn't going to happen.
-fermented foods aren't good for histamine intolerance.  I'm surprised by all the recommendations on this site, I'd be dead if I followed them.
-Sabertooth said stay away from antibiotics, I agree. 
-Bottom line:  keep a food journal.  Eat only one thing at a time unless you're sure it's OK.  Thats how I figured out I couldn't tolerate chard, having it with my safe onions.  Most of my body systems were shutting down 1 yr after chemo (POISON, please everyone learn from me, chemo CAUSES cancer, there are alternatives, I didn't know!!!), going off the psych meds (see beyondmeds.com) I'm also now braindamaged ("severe" said the psych doc about my brain map).  Brain/gut work together.  I'm reversing the damage, up from one hour sleep/night to almost five.  Still can only eat some steamed vegies, started apples for a change.  Tried peeling/cooking pears, got sick.  Used to roast almonds, can't tolerate them now but learned that soaking them 7 hours in salt water, rinsing, then 24 hours in 150 F oven removes phytic acid & makes more digestible.
-finally, taking magnesium oxide (oxypowder) as part of a colon/liver cleanse from globalhealingcenter.com (from truthaboutcancer.com, see for chemo alternatives) which lets me eliminate regularly, though I can't tolerate the probiotic, & I'm not 100% sure about the liver tonic
-just discovered serrapeptase.  Take on an empty stomach.  I was having a horrible reaction, had read about it, found some, popped one, several hours later I was doing much better.  Google it, it's magic.

I see your posts are pretty old, hope you get this.  Even more, I hope you're all better & don't need it!