I guess you'll be the one to know whether your symptoms are bad enough to warrant a redo. You might consider a different surgeon, though. You'll want one who is comfortable with redos. Also, there are skilled surgeons who are willing to do them laproscopically as well.
If your surgeon is hesitant, and you're experiencing problems, then it seems like it would make the most sense to get a second opinion. The trick is finding a surgeon who is extremely skilled in lap nissen AND redos. I always though that second Nissens had to be done open, but that's not true. I've even read where someone had their first one done open, and the redo laproscopically.
There are members here who have had redos, so hopefully one of them will post soon. I am worried that I will need one at some point. After my surgery I coughed really hard for the first two months. I'd been on prednosone, so my tissue was very delicate--the surgeon was concerned about the hernia repair he did. My asthma finally responded to the surgery, but in the meantime, I'm afraid I damaged the repair. We shall see, but I wouldn't be surprised if I have problems because of it.
Good luck, Sirkit. Hopefully you'll get some good responses soon.
You've come to the right place!