Hi letter_vee,
First thing, don't worry too much. Thal minor is not a fatal condition and minors live normal lifespans.
1) A healthy diet is important, as thal minor will deplete many vitamins and minerals. A diet high in fresh fruit and vegetables is important, but that doesn't mean you can't eat other foods. If your hemoglobin level is low, your body will absorb excess iron from your gut, but for thal minors, this is normally not a problem unless their Hb level is quite low, <9. Moderation in consumption of red meat should be observed, but in general what is important is a nutritious diet, low in processed and junk foods.
2)It's difficult to say that your chest pains were heart related. If you ever experience heart palpitations or irregular heartbeat, a supplement containing both calcium and magnesium should be taken daily, as these minerals control the two sides of a heartbeat and they need to be kept in balance.
3) Yellow skin and eyes is a result of excess bilirubin being produced. This is a result of the breakdown of red blood cells that occurs in all forms of thalassemia. The best thing you can do to help with this is to follow a good diet. You can also try B complex and magnesium supplements, as they can help the RBCs to last longer. Staying well hydrated is also quite important.
4) Thal minor may cause symptoms. but it will not kill you. My advice is concentrate on diet and exercise. Proceed as though you have little margin of error concerning your diet and look at what you consume and make sure it is nutritious food. Read through our section on Diet, Nutrition and Supplements for more ideas on how to be healthier as a thal minor.