Reddit reviews Is Vasectomy Worth the Risk?: A Physician's Case Against Vasectomania

Start with http://www.postvasectomypain.org/ to see several anectodes of men who are suffering. There are alot of articles in those threads.

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Here is a book that outlines some research by a doctor: Is Vasectomy Worth the Risk?: A Physician's Case Against Vasectomania

You aren't normally absorbing the sperm into the blood. The specific claim is:

"The testes of a vasectomized man continues to make thousands of sperm every minute. These sperm and/or their breakdown products now have abnormal access to the body, because surgery has weakened the natural barrier between the testes and the blood stream. As the sperm degrades, its degradation products can initiate an allergic response. Also, sperm contains a number of potent antigens, at least eight of which have been identified. Because of this, sperm antigens can stimulate multiple antibodies and alter cellular immunity. Antibody production persists for prolonged periods following vasectomy. Roberts reports one study in monkeys in which sperm-antibodies could be detected seven years after vasectomy.

Men who do not demonstrate antisperm antibodies following vasectomy are more likely to show testicular endocrine malfunction pertaining to hormonal activity of FSH (follicle stimulating hormone) and LH (luteinizing hormone). Just as undigested food provokes an antigen-antibody response resulting in the formation of “immune complexes,” so also do sperm antigens and antibodies. As with undigested food, the sperm-antibody immune complexes provoke severe inflammation in tissues where they are deposited. This explains why, let’s say in 100 men with vasectomies, you would find many different inflammatory conditions involving such diverse tissues as the blood vessels, kidneys, joints, and so on."

This is the original source:

http://www.amazon.com/Vasectomy-Worth-Risk-Physicians-Vasectomania/dp/0963326023?ie=UTF8&tag=libraryextension-20&camp=211189&creative=9325&linkCode=as2&creativeASIN=0963326023

You can read more excerpts from here. Just scroll down to "Vasectomy, Is It Safe?"

http://www.litalee.com/shopexd.asp?ccode=Prostate+Problems

I've heard that supplementing with progesterone, a hormone, reduces the risk of these potential issues significantly.

IME, there is always a cost for messing with the body.