I was you just a few weeks ago. Look for a thread titled "Just trying to get the straight facts". All of the wonderful people here posted a lot of great info for me to get started.
So here's what I would do... No sex, bike or heavy leg lifting for 72 hours before the PSA test. That's the consolidated view I've put together from my hundreds of hours out here trying to get the facts straight.
Briefly, I had a general physical done and my PSA was 4.4 which is just over the limit according to the "standard chart". Check my signature for all of the chronology and you can see my journey. When I visited the Urologist he did a DRE and an ultrasound. I asked the doctor to use extra lubricant for the DRE as I've had a couple of these exams and found that the urologist used copious amounts of lube and it was less uncomfortable. At any rate all of the diagnostics that were done were not conclusive so the doctor recommended the standard 12 core biopsy in his office. I did have my wife with me and it is a good idea. Also bring a notepad or medical diary and a pen to take notes.
My father had very aggressive cancer at age 74 (Gleason 5 + 5 = 10, right now Gleason scores may not be familiar to you) so I thought it was a good idea to contact his oncologist, Dr. Moran. He was very happy to treat me, and actually pursued me to come to him for a consultation. Since I had 3 close relatives with PCa, Dr. Moran suggested a high density biopsy called a Stereotactic Transperineal Prostate Biopsy (I have a post about that too) and I asked for a repeat PSA for sanity (no luck there). The biopsy was done under a general anesthetic and 42 samples were taken. The recovery time for the procedure was really about 2 full weeks before complete normal. I was back and functional after 2 days. There's more blood involved in places where you aren't used to seeing any, and some bruises too. Otherwise I really was not in pain, but a few days of fairly constant discomfort followed the procedure.
Above all find a urologist that you like, can understand and will take all the time you need to talk and explane things to you. My doctor is very patient, smart and will take hours with me if I'd like him to. I couldn't be happier or luckier. Other musings I've made are in my blog in my signature if you are interested.
Be calm now and ready for your initial consult. There is a link here on this site that is a list of questions to ask. Questions to ask your doctor during all stages of evaluation and treatment: is the direct link. Find the questions you want answered and write them down in your diary and bring them with you. Make sure your wife gets them all answered. You may not be "all there" at the time and she can be sure to cover the ground for you.
Remember, you don't know what is going on so you kind of have to live in denial until you do. Pretend a bit that things are "normal" when your anxiety raises. It helps... and "normal" happens to be the truth until proven otherwise. Keep posting here and reading. I turned to blogging to get the tension out. You can find your own outlet.
Oh and I have the same groin area pains that you describe. I had an epididymal cyst a few years back and this feels exactly like it. Dull pain that is fairly constant and episodic. Nothing to keep you from functioning, but there is something going on. When I find out what is going on with me I'll be sure to let you know.