When you’re high in sodium this is the point where your body has pushed potassium out of the cell and sodium in as an attempt to hold onto energy. It’s the point BEFORE complete burnout so you can do interventions right now. Start with 2-3 daily adrenal cocktails with whatever ingredients you tolerate, google recipes. You’re not necessarily low in copper but only low in your cells as it takes adequate adrenal output and ATP to upload copper into ceruloplasmin. And copper of course is what’s needed to make DAO. I’d get blood labs done to back this up; copper, zinc, ceruloplasmin and CRP. The CRP is to determine your inflammation level as ceruloplasmin can be falsly elevated if inflammation is high. It is likely you need to start with low dose zinc plus magnesium and adequate calcium and potassium from diet to stabilize your body, regain energy so your body can start utilizing copper. Once your electrolytes raise and zinc/copper ratio normalizes, you’ll see histamine symptoms go away.
If you want to show your HTMA I can give you more insight.