Lately I've had really bad lower back pain and sharp lower abdomen pains on and off. for a couple weeks now. Then just last nite everything was fine and I was having a conversation with my mom, then out of no wear I started feeling light headed, shaky, nauseous, and felt like I couldn't hear...I sat down because I felt like I was going to collapse. lately I'm looseing my appetite, I'm irritated easily n depressed. My moods feel like their all over the place. I've only puked once tho, and im tired but can't get comfortable n I wake up several times a nite... could I be pregnant?