UK consumer law lets you return it so no worries there. If the support agent has issues just remind them of the law. I highly recommend you start the returns procedure sooner rather than later to avoid falling out of the threshold.
I have a reaction too.
It’s quite uncommon in the 3d printing community, but for me I have pinned it down to general sensitivity to VOCs, most likely which has built up from exposure to drying washing indoors over several years (biological washing powder is the worst).
This in turn makes you hypersensitive to other VOCs, such as 3d printing vapours.
In my case, my lungs become tight, my lips feel dry, and then I get acid reflux (in worst) for days afterwards, providing a burning sensation each morning until the symptoms go.
My solution was to print outdoors in a shed, but now I print in a spare room with a good foam seal around the door, and two windows wide open, along with a fan that moves the air around in the room such that it is exchanged with the outside air frequently. I am then able to print commercially from home with 5 printers. If possible I wait half hour for the air to clear, otherwise I wear a £40 resuseable 3M vapour mask (model #4279) which works perfectly. Cheaper PM2.5 masks are not good enough.
I know some people without a spare room or shed have printed outside in a purpose built box, but this is obviously less convenient, and if you’re in a flat or apartment not possible either unless you have a balcony.
I couldn’t print in the same room… the acid reflux at night was so bad I couldn’t sleep.