Should I see someone?

So my period has been acting up lately. It used to be fairly painless and last at most a week. My mom and sister are the same but once a couple a months ago I woke up and my period started and I got violently sick along with some of the worst cramps I have ever experienced. And then this last time it happened again. I lost my appetite altogether and was so tired I could barely move for days. I lost 10 pounds in 2 days and more the time before. People keep telling me they were just probably stomach bugs that just happen to start at the same time as my cycle but I’m not so sure. Should I insist on getting checked out or am I overreacting?