i have finshed my medication for pid but sex still hurts, why is this ?

I am so sorry that you have been diagnosed with PID (pelvic inflammatory disease), and are still in pain during intercourse...let's see how we can help.

A few questions for you:
1. Was your doctor able to determine the cause of PID? Many times, it is caused by a bacteria from a sexually transmitted infection (STI), such as chlamydia or gonorrhea, and although no one likes to say they have/had an STI, these are easily treated with antibiotics (they are from bacteria). There are other causes, and sometimes it may be unknown what the primary cause was...do you know?
2. What information did your doctor tell you about your PID? I'm hoping you were well informed that it may take several treatments of antibiotics to treat PID, and it is important to use protection (condom) during sex.
3. I hope your doctor also said that you should not have sexual intercourse until your treatment is complete, and as you are still symptomatic (you may have not known you were symptomatic until you had sex, unfortunately!), then you still need further treatment for PID.

It is important to call your doctor first thing and continue treatment, as untreated PID can become more severe. Also, since you have another condition (thrush), please do not take any OTC (over the counter) medications until you speak with your doctor, as there may be drug interactions, and you may need a prescription that can treat both types of infection simultaneously.

I'm sorry you are going through this---please keep us updated on your progress!

In the meantime, you can read more about Pelvic Inflammatory Disease (PID) (click on orange hyperlink)