What's wrong with me? neary passed out

The past couple of days I have been really not feeling myself. I'm almost 2 years out and this is the first time I've ever had spells where I feel like I'm going to pass out. I stand up and I immediately start to feel a headache. After three minutes the lights start dimming and I almost black out so I need to sit back down. Three minutes! I don't know what's going on. Hopefully it'll pass, I'd just like to know if y'all have any idea as to what's wrong.

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