Thought I was in the clear...

I had terrible nausea, with occasional vomitting, from week 6 to week 10. At week 11 I thought I was out of the woods, nausea was pretty much gone, but I would puke more often if I got a bad coughing fit, or gagged while blowing my nose or brushing my teeth. I have puked almost every morning for the last week. And toward the end of the week I was puking up nothing but white foam. Then yesterday (12 weeks and 1 day) my tummy got really upset. When I woke up this morning I threw up tons of bright yellow bile, and have felt completely exhausted all day, I just vomitted a second time, this time nothing but clear bile, water, and mucus. Hoping this is a fluke, and not a sign that the morning sickness is here to stay. Anyone experience worsening morning sickness at the end of the first trimester?