I am borderline anaemic and doctor gave me ferrous tablets to take, but have woken up with swollen eyes, lips and face. is this a normal side effect?

No.: Might want to consider stopping the med. Simple iron supplements are not commonly associated with side effects except constipation. If you are just borderline anemic i would suggest considering increased consumption of good dietary sources of iron. If no symptoms and iron stores look good and you are anemic secondary to menstrual losses, there may not be a good reason to treat anything.