Missed Periods for 2 Months, Negative Pregnancy Test

It sounds like you may have a yeast infection. If you have an infection, you may not get your period as a result of a hormonal imbalance. Yeast infections are often accompanied by white discharge. For relief, try using over-the-counter antifungal creams or pills. To avoid further infections, always practice safe sex from now on. 

It is unlikely that you are pregnant if you were on the Depo shot and he withdrew. The brown discharge and feeling sick could be from hormonal changes or other causes, not necessarily pregnancy. Nausea can occur for many different reasons such as food poisoning or stomach problems. If you are concerned, take a pregnancy test to ease your mind. 

If you're uncertain about your tampon, try to gently feel for the string. If you can't locate it or are still unsure, see a healthcare professional promptly for an examination. Avoid attempting removal without guidance to prevent complications.

Breast pain could be due to many reasons including hormonal changes, breast cysts or fibroadenomas. I propose that you consult your gynaecologist for a clinical breast examination and possibly a breast ultrasound to find the underlying reason of the pain.

Its better to avoid eating anything immediately after taking the medical abortion pill, as you may experience common side effects nausea and vomiting. Its best to wait at least a few hours before eating anything. Still if you do feel the need to eat something, try to stick to bland food, easy to digest like crackers or toast.