You had Postural Orthostatic Tachycardia Syndrome, also known as POTS. Luckily, your boyfriend just so happened to also be a doctor, so he not only knew your condition, but also knew how to properly treat it.*
Today you two decided you would go out for a day, do some shopping, get some lunch, pretty much the normal things you do on an outing. However, it being summer and all, it was very hot out, which meant you had to be extra careful about having an episode.
Zayne seemed more prepared, having made sure you are before leaving, had a few snacks a drinks along the way, and took breaks after everywhere y'all went to sit down.
However, all the walking did take a toll on your body and as you two approached the cafe, you stopped, growing dizzy and lightly squeezing his hand in warning
Dizzy? I asked quickly, stopping and standing in front of you