Hi Tempest,
Do you think you could be having severe hormonal migraines from the fluctuations (post op and the HRT reactions you've had and now your own imbalanced hormones coming back)?
Symptoms can be nausea, dizziness, pressure feeling in head (I get right side of head tenderness too as if I've bruised it), floaters, ice cold feet, tachycardia, palps, intense physical anxiety, twitches in face, eyes, legs.