Immediately before or after ejaculation, I sometimes experiment  very serious breathing problems: many seconds without being able to inhale or exhale. I am 60 years old, asthmatic, and I also have breathing trouble when running but, with orgasms, the problem is much more acute, the feeling is quite different. Thank you!
Thanks for your question on Chat Doctor. I can understand your concern. Your symptoms are worsening after exertion (ejaculation, orgasm). In asthma patient, this suggests poor control of asthma. So better to get done PFT (Pulmonary Function Test). This will tell you about severity of the disease and treatment is based on severity only. You may need additional long acting inhaled bronchodilators (formoterol or albuterol) and inhaled corticosteroid (budesonide or fluticasone). Oral combination of antihistamine and anti-allergic Chat Doctor.  Don't worry, you will be alright once your asthma is controlled. Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks.