I did my BSc before getting type 1 diabetes, then my MSc after. Despite much heavier workload for MSc and research for 5 months in Northern Ireland, I had not real problems. Registered with GP near college in London, then got repeat prescriptions by post and used NI chemist. If security of food or insulin in shared fridges in halls of residence is an issue, then worth getting a small fridge for your room. Also, worth alerting exam service in case you need to leave desk to test / eat; or in a separate room to avoid disturbing other students.