Hello,
You mentioned you have been over thinking. I really can't make a diagnosis from what you've told me. Its insufficient information. Sometimes mood swings happen.
Next Steps
Seek help from a psychologist. You can go for an Online Video Counselling.
Health Tips
Start exercising. Eat regular meals. Have fruits. Maintain a sleep hygiene. Get up and sleep on the same time everyday.You can get in touch with us to help find a good therapist online or nearest to you.