Obstressing
Being or becoming stressed about something or someone you are obsessed with.
Example: She was obstressing over finding the perfect pair of shoes for the wedding.
obstress
the feeling one gets when they are so obsessed on a person / action / situation that it begins to actively stress them out to the point of headaches or nausea
After Ernie sent a text to Maria telling her how great of a time they had on their date that night, he began to obstress when his text wasn't returned within a few minutes, checking his phone every 10 seconds to make sure he didn't "miss it."