Hi nancy,
in addition to prescription medications, mood can be improved by several vitamins and supplements. Which are likely to help you depends on the underlying cause of the problem.
(1) low mood and tiredness may be due to low thyroid function, so add tyrosine and iodine (kelp) to your diet to provide your body with the precursors to the thyroid hormones, which promote energy, elevate mood, and reduce the body's tendency to store fat.
(2) anxious moods (like your tendency to cry) may be improved with more of the calming neurotransmitter, serotonin. Try providing your brain with a serotonin precursors, tryptophan or 5-hydroxy tryptophan (5-htp). Tryptophan is converted into 5-htp, which is converted into serotonin, the calming neurotransmitter that helps sleep. Taking 5-htp itself may cause drowsiness, so it is taken just before bedtime.
(3) nervous tension may be helped with gaba, the brain's natural relaxing and calming agent.
(4) anxiety sometimes results from stimulant induced nervousness so consider reducing your use of caffeine, ephedra, and other stimulants to improve your mood.
(5) anxiety and fatigue can be due to low blood sugar, so consult with your physician to see if you have pre-diabetes. Try vanadium and/or chromium (part of glucose tolerance factor) to improve your glucose metabolism.
(6) for the depression itself, try st. John's wort, and/or s-adenosyl methionine (same).
I recommend starting with a tolerance test for each of these supplements. Try each individually for one week, and identify any that make you feel worse (different people have different side effects). In this process you may also identify a few things that seem to help. You can continue taking them as you test additional supplements for side effects.
Next, find out what the maximal benefit you can achieve is. Take everything you didn't have any side effects from -- a combination treatment will have several components that neither help nor hinder your condition, and by testing all products in combination, you will get the maximal benefit from those supplements that work well together. Expect 1 or 2 weeks for the maximal effect to develop.
Now you will know whether or not non-prescription products benefit you significantly. If they do, this is great, and if they don't, you can definitively say so, and stop wasting further time, money, and effort on them.
If they do help you, continue taking them, and eliminate one supplement every two weeks. If you notice no difference without it, eliminate it permanently. If you notice a decline in your mood, restore the supplement to group of products you are taking. Keep eliminating products until all the products you are taking are helping your mood.
At this point, you will have identified which supplements help you, and which do not.
I hope that this information will help. Take good care of yourself!