Your immigrant visa will only be good for 6 months from the date it's issued, so you will need to use it or lose it and then start the whole process over again with USCIS with another I-130 for you.
One option, and what I recommend, is you can try to delay your visa interview until your kid's cases are at the same stage. Call the US consulate/embassy where your interview is scheduled, explain the situation and ask them if you can postpone scheduling your interview indefinitely, at least until your kid's cases pass the NVC, then schedule a joint interview for all of you.
Another option is that once you have your visa, have your spouse or some other family members stay with your kids while you come to the US, once you get your green card in the mail(can take up to two months) then you can return to your home country and finish out your children's immigration process with them.
I'm sorry that you're going through this experience, I can only imagine the stress it must be giving you. There just isn't really a good quick way to solve this dilemma
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