I am not in shidduchim so I can only try to relate.
About weight-no matter how many diets you go on daven because if Hashem wants you’ll loose it and otherwise nothing will change. Make sure to stay HEALTHY not on carb-free or grape diets, etc. They are DANGEROUS!!! Also, DON’T WEIGH YOURSELF!!!! Its not the weight that counts-its the way you look! Weight always fluctuates and everyone is built differently. NEVER COMPARE YOURSELF TO OTHERS!!!!! It will just make you obsessed and you don’t want to become anorexic! Remember that the right one will look passed your weight and like you the way you are. I have many relatives who got married and were not 2,4,6,or 8. Daven, daven, daven Hashem should help you find the right one soon!