Bad stomach cramps, really nauseous, no period since September... wtf is going on?!

Ja

I’ve been nauseous the past week and throwing up at the same time everyday ( from about 8pm) and I haven’t really had an appetite but if I do eat, I’m only able to eat half of what I’d usually eat. Also, I haven’t had a real period since September. I had some minor spotting but nothing crazy. Has anyone ever experienced this? I have a doctors appointment next week but I’m miserable... help!!