Unfortunately there are no good tightening devices and no lifting devices that will firm the skin and lift the breasts. Surgery is really the only solution.
First off, congratulations to you for thinking clearly about what is most important in your life. Unfortunately there are no reliable non-surgical means to improve your problem areas. However the surgical solutions, if affordable for you, are quite effective and safe. Consider consulting with a board certified plastic surgeon in your area to get more information. Then you can decide if these surgical procedures might, or might not, be right for you