Why am i so hypersensitive to my body.. the second something doesn't feel "quite right" like a dry mouth, tummy pain or dizziness etc, i have anxiety?

Anxiety: You may have general anxiety disorder. Counseling/psychotherapy can help you manage your symptoms. There are also several medication options.

Get alternative care: I think you should probably see a therapist to discover why you have so much anxiety. There's a reason you seem to be critical of yourself and you need to discover what it is. Talk with your doctor about a referral to the correct specialist who can help you.