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I have gone through your query regarding Loss of hearing in right ear, headache and enlarged occipital lymph
Enlarged lymph nodes on occiput indicates either any infection on scalp
or the disease of lymph node it self, but it can't be directly co-related with loss of hearing. I think you may go for these investigations for reaching to a diagnosis-
1- M.R.I. head / brain.
2- F.N.A.C. from occipital lymph node.
3- Pure tone audiometry
4- Impedance audiometry.
By inferences of above investigations we may get a clue about nature of pathology in occipital lymph node, type of hearing loss
and after this a thorough clinical examination by your doctor will help in co-relating the facts to make a suitable diagnosis. As soon as diagnosis is confirmed one may plan for treatment.