How do I talk to my boyfriend about my upcoming hemorrhoid surgery? I'm so embarrassed?

I'm quite young, so it's already crazy that I have such bad hemorrhoids. They're a result of an autoimmune disease which affects my lower intestines. He already knows that I have many digestive issues and has been really supportive of it, and I'm sure he has seen my hemorrhoids since we've been intimate but we've never acknowledged them...

SO, they've gotten bad enough that they effect every part of my life... bleeding through my clothes, extremely painful. My gastrointerologist says that they only solution at this point is in-patient surgery which means that I will be having a relatively invasive surgery where I will be staying overnight in the hospital. I won't be able to have sex or do anything strenuous for about a month.

We live together so this is going to be very difficult to hide... I've mentioned that I may have to get surgery relating to my autoimmune disease but I have not told him what. PLEASE give me some advice.
How do I talk to my boyfriend about my upcoming hemorrhoid surgery? I'm so embarrassed?
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