Fluid Retention Help

Hi all. I'm desperate. For the first time in my life, my period was late, almost 5 days. And for all of those 5 days, I I felt atrocious. I put on 8kg of water weight, couldn't eat because I was so bloated and wanted to throw up just from the pressure, and felt just generally yuck that sleeping was a chore because I couldn't get comfortable. Everyone assured me that once my period came, all the water weight would get flushed out. Well, that didnt happen. Obviously something is up with my hormones, and I'm going to the doctor tomorrow to speak to her about it...but if this sounds like something you've been through and have advice, please tell me! I cant do up my pants, I look like I'm about to give birth and I'm hating everything.