Low cortisol yet only saliva test done: What to do next?

Starting last year, low cortisol 0.69. Now after 6 tests, 11.00. Endo is doing nothing just telemed. Pcp is doing the same. Shaky, weak high and low Bp. Cardio has me on Dilitizem 120ER. Saw interventional doc, did saliva test. Peak at 3 pm and 10 pm. Could not handle the DHEA spray or adrenal pill. Taking ashwagandha and it went up. In pain from bad knee replacement 2 .5 years ago, not a revision candidate. Went through 6 cardio’s have tachycardia. First test was 200 bpm, 2 mins at a time 11 events in 8 days. That’s when the heart med came in. Still shaky, weak pounding heart. No help. New cardio and intervention med doc stated it’s from the pain. But even on pain meds, low dose of 7 mg per day not 20, still having floating feeling, shaky and weak. Getting another monitor next week from new cardio as the others stated it’s the pain meds!!!! Had this before the med! Lost here. Could be POTS. Anyone go this long and have cortisol levels like this and have Bp, tach? Frustrated. In Florida, Gods waiting room. Thank you.