a girl i used to know had these issues. they just came on like yours, and she wasn't taking any medication.
first check with the doctor that prescribed the medication. i don't think it's related.
i think the girl i knew who suddenly had problems with extreme fatigue with nose bleeds had iron deficiency. that could be wrong. but go see a doctor, because this IS something you will need a doctor for.
good luck.
oh, I did have abdominal pain (sharp) from one anti-depressant. I had to switch types. So consider that as well. And keep an eye on your eating behavior/mentality. anti-depressants made me gain 40 lbs in no time by creating binging (doctors don't understand how it happens, just that it does with MANY pills).