I never had leakage other than out.... Well where it should come out.  But I did and still do experience some very painful joints and tiredness.  Most have gone away except for the hip joint pain which I still experience but only after being a sleep a few hours.  The only way to relieve it is to get up and move.  But most of the other joint pain has disapated over time.
I still tire but not as quickly as I used to but all of this I associated to having my colon removed.  I never had any of this pain before.  I had two open and one laproscopic  surgeries.
Now if your pouch is leaking internally... Or you think it is.... that is something that has to be tested. 
What makes you think it is leaking?  I would think that would make you very sick and do it very fast.
I don't know.
Maybe Jan will give some advice.

If you were leaking out of your pouch into your body/peritoneum, that's stool going somewhere it's not supposed to. I would suspect you'd be a whole lot sicker that just aches, yucky tastes, and being tired.

I had take down with a temporary ileostomy July 9th. I'm experience some stomach pain and aching when I get that urgency in my bottom to let stuff out. Last night I had a fever for the first time. 101.6. Not sure if I should be concerned. I've been blogging since the very first surgery in March if you are interested.

Www.lifetakesguts.com

Yes, that fever is significant and should be reported to your doctor.

 

jan

i had on and off back pain for a few months, then started getting electrical zaps down my legs. One morning i woke up and couldnt get out of bed. drove my ass to ER and did CT scan and discovered i had a very small leak in tip of jpouch that was leaking into my spine and i had a spinal infection. immediate diversion that night and alot of antibiotics