Hi, I'd like to help you with your question.
You have been through an enormous amount of stress in the past year. A major illness can take a toll both physically and emotionally. It is not surprising that you are having feelings such as you described.
Because your initial feeling that something was wrong ended up correct, and something serious and life threatening happened, it would be very natural that you would have that feeling again. The confirmation of your feelings the first time make a second time a more likely possibility to you. That is a natural feeling.
There is nothing wrong with going to your doctor and saying you feel something is wrong. People have had those experiences, like you did before, and have been right. Your doctor could at least confirm that you are ok. And it could put your mind at ease. After what you have been through the idea that you are a hypochondriac, especially since it was your feelings that helped you be diagnosed in the first place, is very unlikely to nonexistent. You should trust your instinct and be thorough to the point that you feel nothing is wrong anymore.
If you are cleared medically, you may want to consider talking to a counselor even briefly just to have a chance to talk your feelings out and be certain you are not experiencing a stress reaction to what you went through. A therapist can do an evaluation and offer therapy that can help you better understand yourself.
I hope this has helped you,