Panic attacks after greening out?

Has anyone gone through this? I had a really bad green out smoking out of a bond and they days after I’ve had multiple panic attacks whenever I feel my heart starting to race. It got worse bc u drank soda and had a huge stimulant reaction and it’s just been downhill ever since. It seems like my nervous system is like super sensitive to stimulants rights now and the doctor ruled out physical problems and said it was more of a mental thing for me then prescribed me hydroxyzine.