Thanks for your question on Healthcare Magic.
I can understand your concern.
I don't think your symptoms are due to asthma or hot water shower.
In my opinion, your all symptoms like breathing difficulty, shaking of legs, burping,
belching, reflux etc are due to worsening stress, anxiety and panic disorder.
Your perimenopausal age is also contributing to all these because in this age females are prone for
hormonal imbalance and psychological issues.. So in my opinion, you should
consult psychiatrist and get done
counselling sessions.
Try to identify stressor in your life and start working on it's solution. You may need anxiolytic drugs too.
Also get done hormone levels and if imbalance is there then start
hormone replacement therapy (HRT).
Don't worry, you will be alright. Avoid stress and tension, be relax and calm.
Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks.