I've had dozens of I&Ds, and the surgery you describe is an I&D plus deroofing...a more open and extensive surgery than a simple I&D. So if reports on the internet aren't matching your experience, that's why. Now, on to your questions.
5 days post op, you should have had a bowel movement. Frankly, you should have had a BM within 48 hours of surgery. You need to report it to your doctor and start taking a laxative IMMEDIATELY. 5 days of bowel inaction is dangerous for the health of your bowel, plus if you do manage to have a BM after that long it will be very hard and painful. If you are taking narcotic pain killers, this is very like why you are constipated. I regularly use metamucil twice daily post op to ensure regular, comfortable BMs. Since you are already constipated, treat with laxatives and then set up a fiber maintanence regimine.
A 5 day course of antibiotics is normal, and should be effective. If you have a fever over 100, can feel any hard places around the wound, or observe any skin breakdown around the wound, it could indicate infection or formation of a new abscess. Call your doctor.
What is the general healing process? I find it takes a solid 2 weeks after a procedure with a resulting wound like yours to begin to regain some normalcy. My docs always say things like "Everyone is different, but 3-5 days and you should see significant improvement." HA! Not even close. 2 weeks til you can sit with a donut and shower/bathe without acute pain. 2 more weeks for the wound to heal near entirely. If your surgeon hasn't given you pain meds, insist he does. This recovery is neither short nor easy.
A final note: If you are 5 days post op and still in significant pain, that's normal...to a degree. If you are in too much pain to sleep, or if you spend most of your days howling in agony, return to your surgeon for an exam, and request a full blood panel and a CT with contrast to look for proliferating infection.
Hang in there. It'll get better. And post any more questions you have here...I've got nothing but time on my hands and lots of experience with this.