Does memory loss after waking up from seizure come back?

Unlikely. In general, in the immediate time period after a generalized seizure (the post-ictal period), memory registration is impaired and new memories cannot be properly formed. It is not likely that events which occur in the post-ictal period will be recalled.
Yes and no... There are many types of seizures. Seizures known as "partial complex" may not lead to loss of consciousness, but may cause memory troubles--like writing on the blackboard with your right hand while erasing the thought with the left. Seizures with loss of consciousness usually causes confusion upon arousal; the memory loss may be tied into having partial complex ones before the actual big one.