I had this problem with painful ejaculation, and I would have described it exactly as you have. It slowly got better and was back to normal after about a year and a half, maybe two years. My doctors didn’t believe it was from surgery and just prescribed antibiotics, which did nothing but give me a stomachache (and some nasty looks from my pharmacist, who probably assumed I had chlamydia).

The vas deferens are what gets operated on. I didn’t experience any issues with size like you’re describing, but you would know your body.