Know it all co-worker again

So let me start with this. I suffer from severe migraines and have since I was about 13/14 yo (now 30). On Friday my co-worker asked me what was wrong I told her it was my 3rd migraine in 2 weeks. She kept telling me that I had to drink water because that’s the only thing that works for her. I told her water won’t work for me. She continued to tell me that’s all that will work. I told her I have talk to my doctor about because I’ve been getting them more since I’ve been pregnant. My doctor told me that it’s possible nothing is going to stop/help them because it’s a combination of my hormone imbalance due to PCOS and the hormone boost you get while pregnant. I told her what my doctor said and she told me the doctor was wrong that water will fix it. When I’m at work I don’t drink water but that’s all I drink at home. My doctor even suggested increasing my caffeine intake to see if it will ease it a little.

This co-worker is making me not enjoy my pregnancy one bit. HR won’t say or do a damn thing.