Ireland and the UK are solid options though.
Also, it's most definitely not impossible to practice medicine in a language you're not a native speaker of. For example, Syrians make up more than 1% of all doctors in Germany, the vast majority of which arrived in 2015-2016.
Are you sure histamines are larger than antibodies?
That's 17 atoms if I can count correctly.
Antibodies are made of proteins and should therefore be much larger.