Yep, must be the over 50 crowd here...ehh so am I! I had bad case of hemis myself. So the sawbones I went to had to rubberband some off, then later he did a colonoscopy and while having that done the same doc fixed two more. Then he told me to start taking Fibercon (though I get the generic version from Walmart because it's way cheaper) with the Psillium(sp?) grain in it at a rate of 3 caps in the morn and 3 caps in the eve, and I haven't had a problem in 2 years. I've also increased my intake of fruits, but the doc said fruit alone won't prevent I still needed the Fibercon.
The doc said that hemis are mostly genetic, so family members usually have it. Cycling just agitates it not cause it, so I had to stay off the bike for 3 months mostly to allow for the surgery good time to heal.
I recommend you see a doc that specializes in internal stuff and have him take a peek inside your arse, then have him schedule a colonoscopy to make sure your good further up, the line and then fix the hemis on his way out. The pre colonoscopy routine of cleaning yourself out is the worst part, it's like have a severe case of food poisoning. But get it done, because the sooner they fix it the less severe it will be and the quicker you can get back on the bike, and winter the best time since your probably not riding much anyway.