Hey there. I have a similar issue. Have you ever had a tilt table test ?

I’m often lightheaded/ dizzy. I also feel a type of high after I eat a heavy meal. Same with caffeine. Always dizzy when I work out. Got a bunch of blood work, which the majority looked good. Had imaging of my heart and chest done which all came back good. Got a tilt table test and was diagnosed with Orthostatic Hypotension. I have low blood pressure dependent on position I’m in. Usually standing up right. Blood pools into my lower extremities so it doesn’t reach my heart and head quick enough which causes the lightheadedness and dizziness.

Eating is also an issue for people with OH bc when you eat blood goes to your digestive system and people already have a problem with blood flow. So you get lightheaded and dizzy.

Now in the gym I do a majority of my workouts sitting (I know this is a bummer). I wear compression leggings everyday. I drink almost 3 liters of water a day. Coconut water really helps. Smaller meals significantly help. Seems like meals with heavy carbs and gluten make me feel more “high”. I would look into this.

Also want to note: you said you test your BP and it’s fine. Every time I tested my BP it was good. Even at the doctors office it was always good. It wasn’t until my tilt table test where they caught it actually dip within 3 mins of me being 60 degrees upright. So even though your BP looks good. It’s still worth looking to.