Talk to General Physician on Sudden Weight Loss

sudden weight loss 10kg in 2 months hairfalling and hairs r breaking loss of appetite deficiency of blood sudden changing in physical appearance plz diagnose i m worried alot im pcos patient too my weight is 35 kg now and height 4.11 feet plz help what test should i do i m in a doubt of some cancer in my body my muscles got lossen suddenly continuously diarrhea every weak plz guid which test i should do ?