Worried

Hi,i would like if somebody knows anything about this.I had a baby 4 month ago and 5 weeks after delivery I feel something change.I only thinking about colon cancer because a lot of people I know have that(my friends).I had that deppresion after having a baby and I go to see my doctor.I told her my symptoms that I having a burning in my rectum and I feel that something is still in my anus like unfinished bowel movement.She told me it is hemmoroids and she gave me a lot of different suppositories.I am having the same symptoms for a 3 month and using those suppositories it doesnt help.My bowel movement it is kind ok,i do not have blood in my stool but I have burning after bowel movement.My stool are kind of narow sometimes and sometimes coming out in asmall pieces.Sometimes there is something like white in a stool and I dont know what to do.If anybody have the same symptoms or know what shoul I use please help.I am scared to go to se specialists and my doctor told me it is a hemmoroids,but that is bothering me so much sometimes I have cramps in my leg and butocks.I heard that other symptoms are pain in a stomack so now I do have it only if I think about that.It is in the left corner of my stomack under ribs.Is it my imagination or what is it I dont know but I am scared .Please respond if you know anything,thank you.