It was a nice deja vu.. so why is he feeling sick?

I think its normal for people who have amnesia or memory loss, its because the memories dont actually fit with what they remember so it gives them a headache... i think at least ╮(￣▽￣)╭

the impact of past impulses can ba dire on the person but the effect varies from person to person some can endure it some might go into shock wrst cs scenario but it is temporary..Σ( ￣□￣||)