I Just Feel Run Down All The Time And Nauseous, Headache

Hi, Im a 24 year old girl and I am hardly ever ill. Lately though I just feel run down all the time, I feel nauseus, headachey and exhausted all the time. My last period was over 8 weeks ago (if it helps) and I have a stange feeling in my stomach which wont go away, its like a kinda vibration butterfly feeling. The last day I've also had a small slight stabbing pain slightly to the left from the middle of my lower stomach its not agony but its realy uncomfortable. I had blood tests for pretty much everything and they came back clear, I would really like some help as Ive been really emotional. Thank you.