Cat Worms and Cat Health Issues

Constipation From Parasites?

Okay, for about 2-3 weeks lately, I’ve been having constipation and when I do have a bowel movement, it’s not as much as it should be. This struck me as alarming so I went and saw several doctors and got cat scans, which showed everything is alright.
So please, first off don’t recommend me to see a doctor – I already did.
The only thing that showed up on the cat scan was a cyst on my right ovary which my doctor said was completely normal and harmless and should go away on it’s own. I was ovulating.
So that brings me to this: I’m wondering, might I have parasites?
How can I tell if I have parasites?
Better yet, how do I get rid of parasites naturally?
How do I get my bowel movements back to normal?
Normally, I have about 3 bowel movements a day.
Lately, I’ve been having like 1 movement every couple of days which is not normal to me.
How do I regulate my bowel movements?
I’ve also had strained urination and the doctor said there’s no explanation for that.
I’ve also had a ringworm/rash under my arm & swollen lymph nodes in my neck/throat.
Please help with meaningful suggestions!! Thanks. I’m only 18 by the way.