Well, it seems you're sleeping pretty well if you get 8 hours, so I don't think a sleep remedy is what you're looking for. There are many natural remedies for anxiety, but if you're that sensitive you might need to go to the least effective ones because for you they might be just the ticket, such as chamomile tea or lemon balm or lavender. Valerian isn't that strong, but can make people drowsy. Kava is stronger, but doesn't have the same reputation of making people drowsy, but avoid the standardized versions if you have anything that suggest liver problems. But there are tons of mild relaxants out there, including others I didn't mention -- hops is another. Homeopathic remedies might be good for you, as they have no active ingredients. Now, here's another possibility, which is you say you're "on iron." Most iron, especially that prescribed by doctors and the supplements sold in drugstores, isn't well absorbed by humans. It can also be constipating. Some of your symptoms are those of someone with anemia, but if you're not absorbing your iron it isn't doing you much good. You can get very well absorbed iron through foods such as dandelion greens, beets, parsley, watercress, and other green leafy vegetables. A supplement called Floradix is made from all plant sources so it tends to be the best absorbed iron supplement. Don't know if this will help any, but it's worth a try.
...more additions :)
I am not on any anxiety medications. I tried Celexa and had such a terrible reaction -- weakness, fatigue, quickly lost weight (normal for me is 95 lbs, NOT anorexic, but can't afford to lose weight), very fuzzy-headed, all this lasted for weeks -- that I haven't wanted to try anything else.
I seem to react very, very strongly to medication, caffeine, and even some herbal teas. I tried valerian at night; it was terrible. I'd love recommendation of very mild anti-anxiety or sleeping meds that the sensitive folks out there have been happy with.
I forgot to mention I also hold my breath / shallow breathe a lot.