I think I have hemorrhoids what am I suppose to do? Please help?

It started around march I woke up in the morning at school one day and my anus was itching. And it would happen like maybe once a day. And i didnt know why because nothing went up there. At first I though some how it was warts from sex cause it happened like a day or two after and i thought some how it move traveled to my anus but there was nothing on my penis...so i went to the doctor i got a shot they said i didnt have any STDs and the other person said she got tested to after i went and she came up clean...for some reason i thought it would have went away but til this day it still itches ever so often. I feel stupid for waiting this long but i decided to get to the bottom of it(lol) so i felt to see if there was anything there and i felt like a small bump. So i looked in the mirror and i saw like two small blackish blueish bumps. So i got on the computer and did some research. And it said hemorrhoids can be caused by people straining on the toilet.( Im sure its happened a few times at while at college but i dont know if i did around the time i first felt itching) and somewhere it also said abdominal strain( the itching started a like a week or two before spring break and I started working out everyday for a little while before spring break). And it also said poor diet( my diet at college wasnt all that good now that I think about it). Im guessing thoughs could have caused it if this hemorrhoids i dont know what else it could be..what i would like to know is does this seem like hemorrhoids? and if so how long should it take to go away? and what can I do to help it go away?