Certificate of Employment-AWOL

Hi!newbie pa lang aq sa forum dito.Need lang ng legal advise.Nagfile aq ng immediate resignation sa prev company ko then inapproved ng TL ko and ng TM ko due to poor health. Tapos nung nag clearance na ko ang tagging is AWOL.Wala ko nareceive na notice or information to return to work.May med certificate aq na pinasa as initial diagnosis.Tapos malaman laman ko is walang COE pala!Pag contractual ang company wala ko pinirmahan na contract for renewal for 6 months,obligado pa rin ba yun sa 30 day rendering?Ni walang annual increase as in last time na pumirma ko expired na 2011 pa yun.Sobrang sakit sa ulo ng prev company ko na to puro pa dispute asar!Thanks po.