What Causes Nausea, Dizziness, Lower Back Pain, Headache And Tiredness?

Nauseous, dizzy, lower back pain, headache, tired, got off nuvaring which I was on for about 6 months, had my period and then day 11 I began to spot light brown pink only when I wipe, day 12 the same, day 13 light pink spotting, no spotting since then. This is day 16 and have been nauseous and yesterday I reached for a spoon and spontaneously threw up. Today I was dizzy, nauseous, headache and tired.