Sorry to hear about your mum.
An acute swelling in both legs(?) can be a sign of an acute heart related issue on the backdrop of High Blood Pressure and or
Diabetes. Both these need to be controlled and checked urgently if not done. Seek an advise from your local GP with the him your mother would have been registered or pay the GP for consultation of an overseas member. Secondly visit the Urgent care centre in your locality in UK and seek advice. Thirdly, you can visit the A/E department of your local service hospital or DGH for assessment. Fourthly, if your mum has private insurance then you can take them to a private cardiologist and or a vascular surgeon . Lastly, obtain help from lymphoedema clinic locally to see if anything they suggest. If she is immobile then there could also be a risk of DVT
Next Steps
Please make a video appointment with my team at Your Pain Clinic or at Doctors hub to help with pain aspect. I may help you with making appointments locally in UK or seeing private practitioner in UK as I have worked there for 23 years. Thanks
Health Tips
She would need urgent assessment eg ECG/ Echo/Blood tests