Hello, I've been experiencing the following symptoms lately: dizziness, nausea, constipation, mild headaches, abdominal cramping, sleep problems even though tired, body aches, intensified sense of smell. I've thought I could be pregnant, however I've had two normal periods since intercourse, but heard that birth control (which im on) can force periods. What could be the cause of my symptoms? This has been going on for quite a while, and seems to get worse, I feel very sick all the time.