Vasectomies shouldn't present sexual side effects like you're experiencing, at least not on the purely physical side. Seek out post-vasectomy semen analysis to confirm you're shooting blanks, putting your subconscious mind at ease and helping you finish faster.
Experiment with integrating condoms if they work well for you; reconsider the perceived benefit of the vasectomy if it's causing sexual dissatisfaction. Sometimes going back could lead to a happier place than where you currently are.
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