you can do a lot for yourself:

food: simply observe how you react. there's no universal diet (maybe try looking at your dosha type http://www.mindbodygreen.com/0-1117/...Beginners.html

life philosophy: no, I am not talking "think happy thoughts". Try existialism or buddhism. find inner peace. don't chase happiness... instead learn to appreciate little things. if you are spiritual... go for this. discover yourself. love yourself. have faith in yourself.

finding sense of life: no, you don!t have to have a 9-5 job you hate. You don't have to be what others want you to be. Feel pushed into something? find your own way and you!ll breather freer.

herbs and all that. they are not cure, but they do help. and cup of lemon balm tea is much nicer ritual then popping a pill... it's very nurturing.
i swear by bach essences. they are homeopathic lite flower essences. there's 38 basic essences, each adressing one particular emotion... and can be combined.