Concerned

So I’m starting to get very concerned. I know the most obvious thing is to go to the doctor but I wanted to see if anyone has ever experienced this before. My period was almost a week late. It was super light which is uncommon for me. Basically just pink except for the first day. Now that it’s over I have barely been able to eat the past few days as I’m going through a breakup. However, today I am severely dizzy and my pupils are very dilated both in the dark and light. I feel super nauseous and I’ve barely had anything to eat yet I’m having diarrhea. Every time i stand up I get dizzy and my heart feels like its racing. I also took antibiotics last week for a possible uti as it was burning a little when I peed. Now all I feel like is that I need to pee but nothing is coming out or just little bits. Im starting to get very scared.