It seems that your wavering belief in an afterlife may be exacerbating your anxiety. I want to reassure you that it is not unusual for people your age (or any age) to examine their relationship to or belief in God and an afterlife or to question the nature of existence itself. This kind of thinking is normal and it is an important part of forming your own belief system. But it can be stressful if what you figure out with "reason" is as odds with what your family and society has taught you.

Hang in there.

Most people go through this, at times uncomfortable, process unscathed, but if this deep anxiety continues for a period longer than a few weeks or if you feel as though these fears are interfering with your ability to concentrate in school or to take pleasure in your normal, everyday activities, I would urge you to speak to your family about getting support from a therapist or counselor. A school counselor would be able to provide short-term support and would also be able to refer you to others who can help.

All the best to you.