This is just awful 😒😒

So...I got a bfn a couple of days ago. Now, af is 2 days late. I've had heartburn every night the past week and since yesterday Ive had the worst headache along with a horrible feeling in my midsection. Its sort of like gas pain/indigestion combined, but it's relentless. At first I thought well maybe its because I haven't (tmi) passed gas enough...but I did some stretches & thus ruled that out. Then thought well maybe I need to poop...lol...so later in the day I did. But still feel like absolute crap. And I thought this would be my month 😢 Any advice or experiences are appreciated. T.i.a