Certified GKH Gardening Expert
It is likely that there are other Nettles in the same bed. Lamium Nettles lack the toxins of Urtica Nettles, but the possibility still exists that you are allergic to some of the compounds present in the Lamium.
I think that this one will be better suited for your healthcare provider. We are not qualified to give medical advice, so any allergies will need be dealt with by your doctor.