As you are age 31 unmarried there could be many possible reasons here.
Firstly, kindly check with the general physician to draw out any health related issues.
Secondly, if no physical reason is stated I will request you to consult a Psychologist to draw out any other reason why,¿ (Your life history is very important here)
Also Note: what you share in the session is kept confidential.
Accordingly you can consult the psychiatrist then.
Next Steps
1) Consult a General Physician
2) Consult a Psychologist
3) Consult Psychiatrist
Health Tips
-Whenever you feel scared, it can be because you feel alone and your body feels unsafe. (could be possible trauma in your life?)
-First, You will be required to do deep breathing, keep one hand on chest and one on stomach (10-20 times- breathe in from nose- Hold - Exhale from mouth)
-Do self Talk and tell yourself you are safe, you are at home (console yourself as if you were a small child)
- Grounding Technique: will help you come in the present movement.
Activating 5 senses
5 things you can see
4 things you can touch
3 things you can hear
2 things you can taste
1 thing you can smell
Do practice these techniques for at least 1 week to see the result.