Worsened Chiari Headache after tilt table test

I had a tilt table test done to check for POTS and became incredibly dizzy and nauseas. My HR was 120 but my BP was extremely low. They gave me a nitro tablet and as soon as I placed it under my tongue I got extremely dizzy and nauseas. The test was on Wednesday and I have had the worst chiari headache I think I’ve ever had. I cannot even sit up, let alone stand up without feeling like my head is going to explode.

Has anyone had a tilt table test done and how did you feel after? I’m going to call the cardiologist tomorrow and I also have an appointment with my neurosurgeon on Monday.

Thank you in advance for your help