Burning feeling after taking some pills

Abby
So in the morning I take my thyroid pill, then I wait a little bit and I take a stool softner pill and my metformin pills and eat something. Over the weekend and this am, after I take them, my stomach feels like burning sensation, I feel sick and get the chills. Has anyone else ever felt like this? What is it? This is my first pregnancy and I am a little over 8 weeks.