Constant brain fog and exhaustion

I know it's not my iron or vitamin d, I'm taking both of those along with vitamin c. My thyroid is normal, the only medications I'm on are Zoloft (75mg) and birth control. I'm not overweight (though I don't exercise nearly as much as I should), and I actually lost 10 pounds a few months ago. I'm just so tired all the time. Walking up the stairs sometimes makes my heart race, but it's not painful or taxing to do so. This is driving me crazy, I have no idea what's going on. Is anyone else experiencing this?

submitted by /u/Critical-Ad-5215
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