Idk if it's an actual physical problem that you have or a symptom of a panic attack. After googling , I found that
The following disorders may be associated with Depersonalization Disorder as secondary characteristics.
Panic-Anxiety Syndrome (Panic Disorder) is characterized by recurrent attacks of intense fear or discomfort beginning without warning. These attacks typically begin with the sudden onset of intense apprehension, fear, terror, or discomfort without apparent cause. At least four of the following symptoms may occur: s
hortness of breath (dyspnea) or smothering sensations; dizziness, unsteady feelings, or faintness;
choking; palpitations or accelerated heart rate; trembling or shaking; sweating; nausea or abdominal distress; loss of one's sense of self (depersonalization) or feelings of unreality; numbness or tingling sensations (paresthesias); flushes (hot flashes) or chills; chest pain or discomfort; etc. (For more information, choose "Panic-Anxiety Syndrome" as your search term in the Rare Disease Database.)
So, if it's due to panic, I can only recommend to try to calm down and take something against the anxiety or something herbal like rescue remedy from Bach flowers.