A common belief regarding self-harm is that it is an attention-seeking behavior; however, in most cases, this is inaccurate. Many self-harmers are very self-conscious of their wounds and scars and feel guilty about their behavior leading them to go to great lengths to conceal their behavior from others. They may offer alternative explanations for their injuries, or conceal their scars with clothing. Self-harm in such individuals may not be associated with suicidal or para-suicidal behavior. People who self-harm are not usually seeking to end their own life; it has been suggested instead that they are using self-harm as a coping mechanism to relieve emotional pain or discomfort or as an attempt to communicate distress.
Self harm can be very destructive, not only to you but to those around you who see what you're doing. The rush you get from it is the bodies natural reaction to pain, releasing endorphins into your system giving you that high you experience. This is very addicting and if not taken care of can lead to much worse behaviour later on down the line. Reading through a little more maybe your mom hasn't said anything to you is because she just doesn't know how to approach the subject, or perhaps she just can't believe that her baby would do such a thing. I don't think it would be because she finds it acceptable or not worthy of note.
Stress can be a killer, tired, irritated unable to face up to things have all been linked to high stress levels in one way or another. Maybe try taking time for yourself each day, it doesn't need to be long a half hour or so and do something you love to do, let your mind idle and destress from all the days trials and woes. Some quality "me time" can have a positive effect on your mental state, making things seem not quite so bleak as they used to.
I don't believe in "drugging up" to help, I feel that 90% of the time it just masks the symptons instead of dealing with the underlying problems. Drugs have become to much of a go too crutch for so many doctors these days.
I don't usually respond to these things, I find it hard to put things into words that can be easily understood by others but something in your post touch a chord with me and I had to say something. Sometimes all it takes is a strangers ear to hear our cries and for them to offer their help.
When life knocks us down we just need the intestinal fortitude to stand back up and kick it in the teeth. Never give up fighting.