Had a vasectomy done, very painful, was it done properly?

47, Male-
Went in for vasectomy, during procedure;
Right testicle went perfect & painless.
Left testicle procedure was extremely painful.
Afterward left side was very bloody & Left testicle is very swollen.
Went back in 4 days later; Dr says- no infection- most likely a hematoma but will clear up in time.
Why was my procedure so painful?
Should get ultrasound?

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