Hi and welcome to HCM.
This seems like panic attack
disorder and I suggest neurologic and psychiatric work up. Many people experience such problems,but usually it isnt so intensive. You should learn some breathing techniques for relaxation and take some anxiolytic drugs. Best treatment is to deal with thos eunpleasant situtation as much as you can. EVery time it will be better. Also, you must rulet out some organic disorder of neuro system. Wish you good health.