Help me im scared AF

Ladies someone please give me advice or help me put my nerves at ease.

Let me just start by saying i have irregular periods. BUT this time around ive had my period for about 18 days non stop heavy flow. Usually it last 2 weeks at the most but this time im scared its been non stop😰😫.

Im a chubby gal so i decided to start working out at the gym and try and eat healthier. Ive been working out for 2 weeks now. I thought maybe this is because im exercising and my body's flushing out my backed up periods! But im too the point where im getting migraines and i feel nauseous and dizziness.

I dont know what to do!

HELP ME!