You and I are about the same age (young). I had my right TKR a year ago and definitely don't regret it. I'm assuming you have trust and confidence in your doctor, right? If you have any concerns or doubts (or strong thoughts that you might prefer doing both together), I think you need to make another appointment to discuss it in more detail with your surgeon. And you could get another opinion from a completely different doctor. That has helped some people feel more comfortable with their decision.
One thing I remember being discussed in one of the older threads was the fact that some surgeons don't want to do both knees because of the physical strain on THEM with such a long surgery. This makes sense to me. I definitely would not want my surgeon getting tired halfway through the process!! Some surgeons have a second doctor or assistant perform some of the surgical tasks too (so I have heard), and my personal feeling is that I would not want that. I want the big-bucks guy doing the whole thing!!
But on the other hand, forum members who have had both knees done at once have been very happy they went that direction. That's why I say you have to trust what YOUR doctor prefers to do. They know their comfort zones and you want them comfortable!!
I won't lie to you, you'll be in pain after the first surgery and it may seem like a crazy idea to do it again so soon. But one thing I noticed IMMEDIATELY after my RTKR was that my new joint was SO VERY stable!!! It was a major difference from my old knee. The pain came from the surgery itself and not the joint pain like you probably have now. It 's difficult to describe, but somehow the pain is not as brutal. Plus, it gets better with time where your diseased joints just get worse.
It's a good thing to be having the replacement surgery now while you still have good range of motion - movement. When the range of motion (ROM) lessens, the muscles weaken and things change in your whole body that can make complete recovery to full ROM more difficult. For that reason, I think you are wise to have this done now.
As Jo says, we all were scared just prior to actual surgery. I thought seriously about not doing mine at all as I was waiting through those last couple of weeks, trying to convince myself that I was doing all right and should wait. Fortunately my husband got me back on track. That's the difficult thing about "elective" surgery. It's sooooo.......soooooo.......ELECTIVE!!! Ugh!!!
But don't ever feel guilty if you need another conversation with your surgeon. They deal with this all the time and understand. A good doctor WANTS his patient to be completely ready for the surgery and they will help you reach that point.
HUGS to you. I know exactly what you're feeling and my heart is with you!