Ok bro - then sounds like it could be POTS (postural orthostatic tachycardia syndrome).

The tachycardia can manifest in higher cranial blood pressure, causing headaches.

I think the differential diagnosis would piviot on (1) Whether the symptoms started in temporal proximity to the vaxx; and (2) Whether you're also getting the headaches during the daytime, after a period of inactivity (sitting or laying down).

I think the next step would be to obtain a portable (wearable) blood pressure and heart rate monitor/recorder and collect some data for 72 hours or so. You should also keep a log of your activities (to the minute/second) while collecting data. If POTS is indicated then there are a few very effective options to resolve it. The first is LDN (low dose naltrexone) which has virtially zero side effects. The second is a course of Ivermectin - also zero sides. If you were to try these one at a time, it'll be easier to ascertain which works.

Thirdly, a Stellate ganglion block (SGB) procedure. There's a doctor in the US I can point you toward who's done hundreds of these, with an ultra high success rate and [up until now] patients reporting permanent resolution. He was on the McCullough Report podcast around autumn last year. (I can dig it out if you like). The FLCC Alliance (flccc.net) should also have resources on POTS.