Medical purposes symptoms and conditions

I just finished taking my 2nd pill of Yasmin or oral contraceptives ever. I've always been against oral contraceptives, mostly because I feel they're so unnatural to a woman's balance. I don't disagree on people taking it for medical purposes though. Well I got pregnant and it wasn't the right situation nor timing; and now that's why I'm on Yasmin. I had a prescription laying around that my dermatologist had given me back in April for acne. I decided to "cash it in" at the local pharmacy. The first day, maybe an hour after I took the pill I felt a flood of some feeling in my head. I felt mild nausea, and a small pain in the back of my head that went away as quickly as it started. The feelings of nausea subsided at night, because I took it around noon. My second day on it I felt that fullness filling in my head, I was a little hot, and I felt mild nausea. I felt like the only thing to get rid of that feeling in my gut was to eat. I ate gamesa cookies which are like wafers, light, mildly sweet to calm down that feeling. It kind of helped, but food helped the most. I have taken ginger ale for nausea before and it's helped, but you have to make sure to take the fizz out of it first. In the evening I felt like my head was really heavy, almost tired/sleepy. I hope my body adjusts fast, because I'm not use to being out of balance like this.