Bad Stomach Virus at 5 Weeks

So my husband and I just got back from a vacation in Italy and France, and while we were there we found out we were pregnant. Yay!! Well, three days later I managed to catch a horrible stomach bug: vomiting for 1 day and diarrhea for 5 days - we're talking ALL day for 5 days too (sorry if tmi). I called my OB when we were over there and she suggested I let it process itself naturally, drink a ton of fluids, and get to an ER whenever I get a chance. When we *finally* landed back home, we went straight to the ER. My potassium levels were dangerously low but they were able to bring it back up. My TSH (thyroid) was high but my endocrinologist is working to correct that. My HCG levels were normal for 5 weeks along. I called my OB and they would still like me to let it process itself out naturally (as opposed to Imodium) but I'm really concerned about what this is doing to my pregnancy. I physically can't keep anything in. Although, I also do not want to take Imodium at all! Has anyone had a stomach virus this early on?? Did it have effects on your pregnancy/baby?? I don't have strong pregnancy symptoms right now but I'm not sure if that's because my body is fighting off this virus. I miscarried back in March so I'm freaking out that this will have the same fate. 😭💔 thanks in advance.