Hi I suffer from anxiety at night in bed.. It's taking over my life.. I have slight dull headache and pressure in head so I think I've got a brain tumour, I have a blister atm in my throat I think is throat cancer. I check my heart beat constantly, look up slight pains on Google.. Went to doc on 50mg sertraline for last 6 weeks but not helping... I need to stop thinking on a night time .. I dread going to bed and not sleeping just lying awake worried that it's my last day on earth!!