TL;DR Been suffering fairly intense brain fog, dizzyness, lightheadedness, and head pressure for the past two days. Need advice.

A bit of backstory. I, 26M, have been struggling with cardiophobia for about a year now due to excessive heart palpitations. I have been in and out of multiple doctors trying to figure out the source of my palpitations to hopefully ease my anxiety. I've had thousands of dollars in heart tests done, been on buspar for about 8 months now. Yet my palpitations and anxiety persist.

Back to the topic at hand, two days ago I randomly started feeling very lightheaded, pressure in my head, and foggy. Just out of the blue. This slowly got worse throughout the day and I thought maybe I didn't sleep well last night. I have been on cpap therapy for a few months now so maybe I didn't get along with my mask or something.

Fast forward to that evening and I was fully convinced I was about to have a heart attack or a stroke, whichever part of my body felt worse at the time. I sent a message to my PCP and they said to try to eat something because my blood sugar may be low. So I ate, and finally forced myself to fall asleep.

This morning I woke up feeling a bit better, took my morning medications and headed to work. As soon as I got in my car I immediately felt the foggy/dizzy/lightheaded feeling again. I managed to make it to lunch before throwing up and going home. I slept the rest of today and got up when my girlfriend got home and my symptoms are back again. I have no idea what initially caused thus to happen or why it's stayed with me for two days.

My inital thoughts are I started taking Omega 3 supplements a few days ago and maybe they aren't agreeing with me, Or maybe I got some food poisoning the other day, or maybe I haven't been sleeping well, or maybe it's my anxiety, or maybe I'm getting sick. I was in the ER on Saturday due to my anxiety and heart palpitations (I'm fine btw, just another horrible night of nobody knowing what is wrong with me) so maybe I caught something there? I'm so fucking lost.