First if you're stressed or anxious & rmember these are things you don't always realize you're feeling - they can be very subconscious!! - you should first try things totally nontablet - like pilates, meditation, relaxation (there are some good tapes,dvd's & videos around to help you with these.
The sam obitz book is another ssourse of non-tablet help (google sam obitz & you can order the book on-line less than $20).
The above suggestions take awhile to get through to your sub-conscious & so start actually working!! But if you learn how to use & actually put them into practise they can help you in any stressful or anxiety type situation for life.
The natural meds I mentioned you can get from most health food stores or on-line (google under each - or on-line pharmacies or biosynergy or club natural both on-line).
5htp is a form of tryptophan which is in many foods we eat & is converted to 5htp & sent through our body to our brain & to our seroronin deposits there to balance stress - but sometimes our system doesn't work properly so this doesn't happen or if we become overloaded it doesn't happen "enough" - not enough gets through - so you can take 5htp supplements start at 50 mg once a day & if after 3-6 weeks no real change up to 100 then higher as needed max dose i've seen is 300mg perday but you can read about all the details on line just google 5htp.
St johns wort (a problem re pregnancy but otherwise ok) also reduces stress levels as does vitamin b (also long hot baths with candles, a drink & a good book - another form of relaxation). Buy at chemist/pharmacy or health food store.
Dhea - google for the full scientific name - but again basically it puts into our system chemicals that are out of balance - can also up your sex drive!!
Sam-e is another stress chemical balancer, I take 5htp, sam-e & vitamin b.
A psych I know also recommends a walk 30-60 mins every morning around dawn as even if its overcast there's something in the sunsrays at this hour that works on our serotonin levels & reduces stress.
If you'er still confused pm me.