Deep vein thrombosis with leg swelling and pain is a serious condition that needs urgent medical care. You should be under a doctor's supervision for blood-thinning treatment, leg elevation, compression support if advised, and regular follow-up to prevent complications.

A severe headache on one side can be due to migraine, nerve-related pain, or other medical causes, and it should not be ignored. Given your history of taking Pradaxa, it is important to consult a doctor urgently to rule out any serious cause and get a proper evaluation.