I lost 7 pounds since Friday and it is freaking me out. Last week I have been trying to gain weight and for the most part it was working, but then yesterday and today I have been losing weight. I stopped taking an antibiotic (minocycline) on Monday so this might be affecting my body. Today and yesterday I have been feeling full all day when I did not eat too much. I feel nauseous too.
It's good to feel concerned but don't get too freaked out just yet. There are plenty of boring explanations for something like this, like water retention or a change in waste disposal (poop) . I'm not a doctor and i dont know all your info, but just from you saying you stopped taking medication, makes me think there's a relation.
So, besides the basics, like water & poop, also, gut bacteria are affected by antibiotics, that may have something to do with it. Could explain the nausea...
You might want to do some research, Google a few phrases, starting with "antibiotics weight loss"... And maybe eventually decide to take a probiotic or something.
Don't get too freaked out though, seven pounds may seem like a lot but the body fluctuates quite a bit, normally, & you did change something big (antibiotics) so the fluctuations could be exaggerated.