When you go see the herbalist, check their bookshelf for Vogel's Nature doctor book, and maybe just browse through it.

Tinctures would be for internal use, he recommends it, for intance, in certain situations, for lactating moms. there are other things but mostly he recommends it for external use, in oil form, I assume essential oil.

St John's wort is somewhat toxic in high doses, since you have taken so much of it it might be wiser to simply lay off for a time rather than even try topical treatments (wrist is a good area, ankles, back of your neck, anywhere really) Vogel mostly recommends it externally for skin conditions, acne and rashes.

I don't know what the problem with me and lemon balm is, I love the strong lemony smell of the plant more than anything which is why i keep it around. I might drop a few leaves into ice tea now and then, that's about it. I think it's a lot stronger (fresh), whatever is in it, than most people want to believe. Either that or I was more toxic than I knew when I tried to use it daily.

If all of these codex and related things really look like they are coming down the pike it probably is time to buy some seeds and plant a flower garden. Be really careful with the fresh herbs, they are all much much stronger and more effective than the stuff you buy in capsule form OTC.