Firstly - bleeding cannot be ignored - a further exam is needed to try to determine the cause. It is unlikely to be Potters - but suggests something else is going on such as a UTI or stones.
Potters contains diuretics ect and it can;t be ruled out that it could contribute to stones/exacerbate symptoms in a "susceptible" piggie. I would stop giving this immediately until the cause of the bleeding is diagnosed.
Moving on to the arthritis side of things:
Maple was diganosed with severe arthritis in 3 of his limbs over a year ago (by Xray).
He is under constant vet care from my very experienced exotic vets.
Currently I give him meta-cam every day (dog meta-cam with doses increasing over time - he is now up to 0.3ml daily). I also give him trama-dol pain relief for his bladder and arthritis as this seems to be a better pain reliever than meta-cam which is still given for it;s anti-inflammatory properties ref the arthritis.
I have used Potters tabritis tablets on Maples father - Grommie - but to be honest i didn;t see any real improvement in his condition...and in any case Grommie was just "old" - no real signs of arthritis. Potters shouldn't do any harm - although they do contain a diuretic which could be contraindicated depending upon your piggies condition so I treat all herbal medicines with complete respect and discuss with my vet first before giving them.
I think the key to treating arthritis is determining exactly how it is affecting your piggie (Maple gets sore hocks, sits in his wee and is at risk of urine scald. He also loses a lot of weight because he doesn;t eat enough, leading to gut problems and dental problems, if he doesn;t ge daily pain relief). That said as long as he is pain free - he is his normal perky self
I'm happy that now, after a year, I have found the right balance between natural and pharmaceutical assistance for him.
Happy to talk - about arthiritis or Maples "bleeds" which he has been having for the last 8 months (that are completely unrelated to his arthritis)
Pm me if you want my phone number.
HTH
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