Intestinal worms, extreme weakness

I feel tired and fatigued all the time. Idleness and weakness metally & physically.I had stomach/intestinal worms in my childhood. i used to have itching in rectum and since then i m always in suspision that i still has worms & my fatigue/weakness has some connection with these worms. I off and on took aloepathic medicines also homeo compound medicines for it.
Back 3 years i took a dose of aloepathic but seen no worm in stool again 3 days later in desperation i took double dose and a single long dead worm came in stool. And recently a month ago i have severe diarrhea and motions were as loose as water then a MOVING WORM came along with motion. My allopathic doctor says that a single dose i enough to expel the worms i still doubt that these parasite still living in me and living on me and sucking blood killing me softly.I think these worms got stronger and resistant to medicines. I still some times feel kind of itching in rectum.
I sometimes think i have worms ethink it just a obsession. You are doctor better to judge according to my case.

Pleae can these worms survive for such long time and create so much weakness also if i have the worms, is there any particular stool test or method to dignose the presence of these worms?
Can homeopahty kill and expel these as i heard homeopathy work slowly?

I shall be thankful