I am a GP who has left, not for another country but I have changed career completely to a non medical field.
I cannot begin to tell you what a miserable job it has become. Even in the 10 years I was qualified, the job changed beyond recognition, due to chronic underfunding and understaffing. Ridiculously long hours, spent working full throttle doing 10 minute appointments (and yes, that's to read the notes, get frail patients to totter to the room and sit down / undress, see and examine the patient, and write up the appointment notes, before moving straight on to the next patient). Repeat x40 per day, with the pressure to continue to think clearly and make safe decisions whilst exhausted. Naturally, with a complex and aging population, very few things fit into a 10 minute slot. I was often 'running behind' and taking abuse from the patients coming after for that. Add on top of that a mountain of blood and investigation results to interpret, making referrals and responding to documents, reauthorisation of prescriptions (approximately 80 a day per Dr where I was) home visits, meetings, learning, managing staff who are often in tears from the abuse they take at the front desk, teaching junior doctors and medical students.
The pay is roughly 10k a session per year (a session is a half day). Its very difficult to work more than 3 days a week without completely burning out due to the hours, pressure and emotional toil. You then need to subtract from that the ridiculous indemnity fees (which were vastly more than my mortgage per month), subscription fees, GMC fees, etc etc.
I graduated literally top of the class from a highly esteemed UK medical school, and also have a further science degree. I excelled in my GP training. I really loved science and I really loved medicine. The NHS stamped every last ounce of it out of me and I now work in a completely unrelated non medical field, where I am treated with respect and I have the time to actually speak to the vulnerable people I help. I don't regret the time I spent as a GP as it was a privilege to help people at their most vulnerable, nomatter the toll it took on me personally. Never again thought would never advise my children to go to medical school.