Hi
I am Dr Mittal.
I have read your message.
I think I can help you.
I think he has developed an infection of the arm, which is getting partly covered by the antibiotics that he is on.
The feeling of heaviness due to edema of the hand, which may initially not be obvious, probably explains why he has aches and feels better when the arm is raised (the gravity drains the edema).
And the possibility of infection also explains the flashes of hot and
cold.
I think you should meet a surgeon and get the nail removed.
It may have become a possible source of infection.
An
HRCT chest may also be needed.
Let me know the report of CT Chest.
I have tried to make it as simple as possible.
Feel free to contact me for any related doubts.
Best of luck, Dr Saumya Mittal