I went to USA as B2 and get E2 visa, then I came back to Pakistan for my surgery so can I travel again on my B2 visa?
Your question is a bit confusing.
If you have an E-2 ... and you intend to continue to run your business in the US ... use your E-2 ... not B-2.
Talk to the lawyer that helped you get the E-2.
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You need to enter the country in the status you are intending to hold... The rest is confusing and it's best if you speak with your lawyer...
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