Hi,
Stress and unexpressed emotions can cause above said symptoms. Express your feelings to the girl in a gentle way, but be sure she has all the rights to take her own decision and you need to accept it.
Next Steps
consult mental health professional for further guidance
Health Tips
tips to overcome Anxiety
1 Learn relaxation techniques like slow deep diaphragmatic breathing, progressive muscle relaxation technique
2. Practice yoga and meditation
3. Practice mindfulness
4. Regular physical exercise
5. Avoid alcohol and smoking
6. Good balanced diet
7. Good night sleep
8. Quality family time
9. Good social network
10. Keep yourself occupied with work that you love