Can Nexito And Nitrest Cause Heaviness In The Head?

hello ,im 45yrs old for the past 15days i have started nexito 10mg in morning and nitrest 10mg at nite i take around 9pm and after 30mins im flat till morn 5.30am.Morning time when i get up head is very heavy and feel weepy and sad. , after sometime im ok. except after i take nitrest i dont remmember clearly what i do,what i hv talked,walk like drunkard.this is scaring me.how can i taper it? pls help me. i feel i shud stop it.felt good sleeping after 15months otherwise wud just get 3-4hrs or recetly just 1-2hrs.thnxs