To help you answer your question more, I will need a little more information. What do you mean that you had the first lining of your uterus removed? Was this a D&C procedure? Do you know what was found at that time?
Do you have any other medical problems? Taking any medications?
First of all, at 38 years old, your chances of having endometrial (or uterine) cancer are extremely low, and second of all, the fact that you are no longer having your period and experiencing pain are not usual symptoms of cancer. It sounds like this is a major concern of yours, so I would like to just help you to feel more relaxed that this very unlikely.
If you had a partial hysterectomy, this is also referred to as a subtotal or supracervial hysterectomy which means that the entire uterus is actually removed, leaving the cervix behind. This is in contrast to a total hysterectomy in which the cervix is also removed. It sounds like there may have been some confusion regarding exactly what the procedure that had been done was - because with a partial hysterectomy, since the uterus is removed, after the surgery, you should not menustruate anymore. Since the ovaries are left intact, you will still experience normal hormone levels, but will not experience monthly bleeding. I am attaching a link for you to learn more: http://www.womentowomen.com/hysterectomyandalternatives/vaginalandpartialhysterectomyoptions.aspx
If, however, the procedure was a D&C or dilation and curretage - and not a partial hysterectomy, in this case the lining of the uterus was scraped to remove polyps or other sources of bleeding - then you could have a different problem, also a common complication, called Asherman's syndrome which is the formation of adhesions after the procedure causing you to stop menstruating normally as well, and a common cause of pain. Here is a link with more information about this: http://www.nlm.nih.gov/medlineplus/ency/article/001483.htm
It sounds like the most important thing you can do is clarify exactly what the procedure was that was done, because if it is the first situation, it is completely normal that you do not have your period - and now the cause of the pain will need to be investigated; whereas if the situation is the second, you should be able to recover menstrual bleeding and relieve the pain by a surgical procedure to release the adhesions.
I hope this is helpful and please let me know if I can answer any more questions.
That information is very helpful and it is certainly possible that some of your pain is the result of the PID that you had a long time ago which has caused adhesions that are causing you pain and discomfort. If the procedure is what you are describing and you still have your uterus, then this is not a partial hysterectomy. Please do find out the name of the procedure because what was done at that time will certainly impact on how your current situation is managed.
Have you spoken to your doctor about the way you have been feeling? What does he/she recommend?
Then that can explain the problem; your combined history of PID with this recent surgery that left your uterus intact means that you should be having menstrual periods monthly and suggests further the possibility of Asherman's syndrome which is a secondary amenorrhea, meaning you stop getting your period, because of scarring to the uterus following a history of bad infection, i.e. your history of PID, coupled to manipulation of the uterine wall, i.e. this recent biopsy. A pap is not going to resolve the cause of your discomfort, and waiting until April sounds like a prolonged amount of time. Would you consider a second opinion?
It does not sound like something serious, i.e. life threatening like cancer. You should not worry - your only concern should be seeking out a way to resolve it and it should be investigated by your doctor. If it is Asherman's (by the way, this is an informative article about it: http://health.nytimes.com/health/guides/disease/asherman-syndrome/overview.html) this can be rectified.
I hope this is helpful and please let me know if I can answer any additional questions.