Could all these problems be related?

I have been doing a lot of research on sebaceous prominence (sp) the past weeks and am starting to think that it is because of a bacterial infection.  I am 18 years old, 5'9 and weigh 135 lbs.

Here is the list of problems that I think are related:
-sebaceous prominence (for 3 years now)
-constipation (i poop about once every 3-6 days) also for about 3 years now
-itchy rash around my anus that i have had for about 2 months
-inability to gain weight, which i have always had
-constant tiredness (since high school started, which is about 3 years)

I was going to take something called humaworm to get rid of this possible bacterial infection and then do a liver cleanse, but humaworm has wormwood (a herb that isn't so safe) and the liver cleanse is based around epsom salts which has these warnings about it on the liver cleanse page.

Liver Cleanse Website -

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Humaworm Website -

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Please give me some advice or any of your hypotheses on what i have/what to do/how to do it!  Also, if you share any of my symptoms, please say so, b/c the cause of many peoples sp could be from this bacteria problem!  If you are wondering what this bacterial infection that im talking about is, all the information you need is on the liver cleanse website!