Its rare to be just depleted in one mineral, and one vitamin.... When one nutrient is low there are often many other nutrients that are depleted or out of balance as well. This is why it takes a holistic lifestyle and dietary approach to properly take care of the underling issues.
If you are stressed , anxious and worried, taking supplements and eating better may give you some improvement, but if you want to completely overcome your issues, you will need to create a healthy lifestyle to mirror your healthy diet.
I know a one month vacation in paradise, while obtaining the most optimal food, isn't always the easiest thing to do... this is why some people look to supplements as an easy fix for their chronic problems.
Well I'm here to tell you that there is no easy fix, so you must be willing to make serious changes to your diet and lifestyle, that will reduce stress, while giving the body optimal nutrition in order to have real and lasting results. Optimal nutrition, in the view of many here on the forum includes paleo quality raw animal foods and paleo approved plant foods as the main staples of the diet.
I personally recommend Sunbathing on a warm beach, as a way to help with stress. Fresh air, sunshine, and time off are just as important to overall well being as a healthy diet.