scared

Okay, My boyfriend and I always use condoms. But my period should have started today, I feel a little bloated, tired and then sometimes restless, nausea but no vomitting. Two negative pregnancy (home) tests, but still no sign of my period. My back aches, and i’ve had headaches, and I’ve been feeling a little under the weather. However my boyfriend just left for Iraq for a year at least. Could I just be under stress, and thats why I have these symptoms? I really hope so. Can someone give me some insight??