The discomfort might come from your previous Gynecomastia surgery. One side of the chest could have pain because of inflammation or collection of fluids. It would be best if you saw a doctor about this who can advise on what treatment may be needed and any further tests that need doing. 

Height is typically inhe­rited from relatives. Magne­ts lack ability to make you taller. Some false­ly claim magnets aid growth, but this isn't accurate. Eating nutritious foods, exe­rcising frequently, and slee­ping sufficiently contribute to reaching your maximum pote­ntial height. 

Uneven size of breasts is quite a common problem. But, if you think yours are too small, it is good to know that size has nothing to do with your health condition. The short breasts can be due to inherited characteristics and also hormonal fluctuations. 

It is usually not recommended to get nose job at 14. It is advisable to wait until you have got the physical maturity. Thus, most surgeons recommend having a rhinoplasty in your late teens or early 20s. But still I advise consulting a reputed plastic surgeon in person for proper evaluation and assessment of your individual condition. 

Neither of these treatments is recommended for children under the age of 18. Chemical peels and laser treatments are not permanent skin whitening treatments. These treatments can help to reduce the appearance of dark spots, but they will not permanently lighten the skin.