Topomax is the brand name of a medicine called topiramate. Basically it is anti-epilepsy agent but it is also used in the prevention of migraine attacks. However its role in relief of acute attacks, once they occur, is not proven. Similarly Sibelium is the brand name of a medicine called flunarizine. It is indicated to prevent migraine attacks. It does not have a role in relieving pain once it occurs.
Very common side effects of Topomax are difficulty with memory/concentration/attention. Paraesthesia is also very common.
I am unable to comment on the appropriateness or otherwise of your medication since there is no information on the past use of conventional anti-migraine medicines such as betablockers, pizotifen, methysergide, sumatriptan, rizatriptan, etc.