There is the possibility you don't need copper. Copper can be associated with fatigue. You didn't give dosing of zinc/copper, but if your zinc is, say, no more than 30 mg, consider dropping the copper and seeing if that changes how you feel. If at some point you want verification of what you're doing with respect to your past issues, you can order lab tests yourself if you have a LabCorp facility nearby. Results come direct to you. There is the tricky part of figuring out what to DO with the results, of course :)
Being sleepy is the darndest symptom to track down the cause of. I recently discovered I was sleepy in the afternoon due to the vit C I was taking with lunch. Think it raised my glucose, which required insulin to bring down. My body usually overshoots doing this, and I was getting sleepy from low brain glucose. I kept sucking on peppermints, and finally realized the sugar made my brain feel awake, which made me think I needed glucose which should have been available from lunch. Stopped the vit C at lunch, and no more sleepytime.
On the other hand, sleepy is also the nasty side effect of candida die-off. Actually, you said "fatigue" at first, which I feel differently about than "sleepy." With "fatigue" I thought of the copper, since it was a recent addition, but with "sleepy," I think of detox and/or food issues, and sometimes magnesium (for me).
You're okay with 50 mg zinc. You may even be fine with the copper. But just because a book says they're needed together, doesn't mean your body read that book. In my mother's case, for instance, she has evidence of copper overload, such as reddish highlights in her hair, arthritis pains helped by glucosamine, and hyperemotionalism. I recommend only zinc to her.
You'll know if you have too much magnesium if you get diarrhea. Then you've passed bowel tolerance and need to back off a bit. Till then.... I've found this site to have useful guidance for minerals --
http://www.acu-cell.com/crcu.html
Yesterday I listened to a podcast from Byron Richards, a nutritionist who also likes a basic approach, although he doesn't care for more than about 5 mg of iodine. Anyway, he reminded me for the upteenth time that inflammation on the neck, shoulders, and scalp is frequently the result of lymphatic backup. The body is trying to take out the trash (from the lymph), and is having to do so through the skin. It has to use the skin because its preferred organ of elimination, the colon, is in disarray. That suggests to me that the origin of your scalp/neck issues is your colon. Bacterial imbalance, candida, other pathogens, who knows. But if you get your gut working right, so the trash can be removed appropriately, your body'll stop trying to use your skin for that.
It's an idea, anyway :)
I'm no expert on this. All I can offer are some nuggets from a course I just finished. One of the classes was on germ gangs residing in your colon. The author said, "Germ gangs only live and thrive in weak body tissue." He recommends restoring physical fitness: building muscle to activate genes that rejuvenate; improving aerobic fitness to deliver oxygen to tissues, killing germs in the process; and getting to your goal weight and staying there. Sometimes adding fiber can help, as can taking some probiotics. Germ gang disrupters include borax, oregano oil, colostrum, and lactoferrin. But ultimately making your body strong will make your immune system and digestive tract strong as well.
I don't see a problem with your supplements. My bias is towards getting vit D levels to 60-80, and to include some form of vit K with it. By the way, he answered a question about itching, and replied that nerves, germ gangs, and/or the immune system can interact with mast cells to release histamine. Maybe that's the source of your itching.
What a mess! I'm probably out of ideas after this, but I hope for the best for you. I'll be gone a few days, so I'll check back later.