My apple watch caused debilitating migraines

The most common side effects of Apple Watch are arm discomfort usually due to either having the band too tight or excessive unfamiliar movement to play with the new toy, and very occasionally a localized skin reaction caused by sensitivity to one of the components (usually nickel). Persistent Migraine type reactions are not even documented as a likely problem, so I suggest you consult your doctor - just in case it is something more serious which you have incorrectly assumed is caused by your watch.

I am seeing my doctor tomorrow, no worries. But you’re wrong about the waves. If you don’t have radiomagmetic sensitivity it does not mean noone has it too.

That's true. However, the science indicates there is no such thing.

look at the results of this study: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5279981/

That was a study of 114 people based on self-reporting through questionnaires. There was no control group and no blinding. It took place over a total of six months. The causative mechanism they proposed was based on an epidemiological study that stated "As a higher risk for car accidents is the only scientifically established adverse consequence of mobile phone use" and from there suggested that the car accidents might be caused by headaches when the far more likely caused was driver inattention. The journal in which it was published, Electron Physician, has an impact score of .85.

Interestingly, they did mention a double-blind, placebo controlled study, a much more rigorous methodology, that indicated certain types of EMF fields decreased migraines.

And, it's always important to keep in mind that correlation does not imply causality.

Seems like my head has an allergic reaction to the radios frequencies of my watch.

Do you also also get headaches from your iPhone? It uses exactly the same frequencies, and it has a higher maximum output than your Apple Watch, and it is typically used much closer to your head when in a call and transmitting more actively. If you are sensitive to RF from cellular devices you would have found out about it long ago before buying a watch. Your watch only uses cellular when it operates in standalone mode, so for the majority of the time it uses lower power Bluetooth over short range to your iPhone, usually around 1/1000 the RF power of your iPhone.

Go see your doctor. The watch is not the problem.

I have never heard of the symptoms which you describe as a side affect of using an Apple Watch.

Important safety information - Apple Support lists several hazards, but your problem is not one of those.

Unrestricted returns are limited to a 14 day period. In your situation, you should consider selling it to a third party.

If you have suddenly developed serious headaches, you should be seeing a doctor, not posting on a technical support forum. Serious headaches can be a sign of something like a brain tumor.

Note that neither migraines nor brain tumors are caused by radio waves.

See your doctor immediately.

...so where did you get an Apple Watch Series 4 for $100?

The answer is obvious...stop using it.

Perhaps you are allergic to a material in the watch case or the watch band.

You should see a doctor and be tested for an allergic reaction to any part of the Apple Watch.

That study is completely worthless. Multiple double blind studies have shown that there is no such sensitivity.

Please go see your doctor and listen to them instead of googling your symptoms.