Hi and thanks for the query, It is not unusual t experience bleeding abnormalities, especially with contraceptive implants. It is advisable to consult your doctor for a proper evaluation in case of excessive bleeding. Other contraceptive options could be discussed and proposed. Excess bleeding for the time being can explain weakness and tiredness due to excessive blood loss. Examined the back for pain might really have no relationship with the bleeding. Ultrasound, X rays could with good physical examinations could be of immense help. The mood problems might to be discussed in depth with first, your primary care physician, and then seek the services of a psychologist. These could be good starting points in the management process. Wishing you good health. Bain LE, MD