Your symptoms still do not suggest STD. Not knowing the basis for the diagnosis of prostatitis it is hard to comment, but I will point out that it's often a "wastebasket" diagnosis when a provider cannot otherwise explain vague genital symptoms in men. There is no such thing as an "STD locked away in the prostate". The natural course of untreated trichomoniasis in men usually is spontaneous cure over a few weeks to months, so it really isn't an issue and in any case does not cause the sort of symptoms you describe.
Two days ago I posted the following in an other thread (
http://www.medhelp.org/forums/STD/messages/3025.html). I have the feeling I'm going to be using it a lot. Here it is:
It is a fact of life that human beings get various aches and pains. Out of the blue there is knee pain, a headache, abdominal discomfort, a stich in the side, tingling down a leg. Sometimes such problems are continuing or recurrent, yet no specific cause ever is found and clearly no important infection or disease is present.
Why should the genital area be any different? Not every symptom means disease. People with such symptoms of course should see a health care provider. But when a comprehensive evaluation comes up with no good explanation for genital symptoms, and if they persist after treatment of the potential infectious causes, it is wrong to assume a serious health problem. Just as some people have to learn to live with unexplained but benign headaches or abdominal pain, others have to live with unexplained genital symptoms.
Our genitals have a special place in our psyches, and unexplained discomfort can be harder to ignore than for a joint or even the head. But the principle holds. It's fine to look for harmless things that might help control symptoms. But potentially harmful treatments (e.g., repeated high doses of antibiotics, potent pain controllers) make no sense, and doctor-shopping (or internet shopping) for different answers generally is fruitless.
I hope this helps. Good luck-- HHH, MD