Back Flower Remedies work, they just work differently for each person/horse/etc. For instance, Bach has a Rescue Remedy product that is little edible pastilles - for my BF, if he takes one he almost instantly feels a calm, for me they don't do anything that drastic however I find that if I can't fall asleep at night and I take one, it will put me right to sleep.
You have to be careful with alternative therapies as there are a lot out there that market themselves really well but are totally bogus. I work in an alternative health store, so I am kept fairly up to date as far as human-friendly products go, so if you ever have any questions about specific products you are more than welcome to pm me. We do work with some stuff for animals as well, but mostly human products.
I've done my level one in Bach flower therapy and as Carleen has said they have the rescue remedy, which is made up of 5 of the different flower remedies mixed together. Altogether there are 38 bach flower remedies, but they don't treat symptoms as such they are more based on personality types and I've found them to work really well on humans as well as all animals. The really great thing about bach flower is they are made from flowers in the same way that Edward Bach did when he first started the remedies and the house where he first made his remedies is still used now and grows most of the flowers :)
I don't know much about oils but I think that all these kinds of therapies work and id definatley give them a try.
Again as Carleen has said id be careful where you buy them, there are cheaper remedies similar to bach that are not guaranteed to have the same effects :) hope you enjoy learning about them