Brief Answer:
gum infection, teeth cleaning, nothing to worry about heart disease
Detailed Answer:
Thanks for your query. I have gone through your query. As far as the pain in the wisdom tooth is concerned, it can be because of the gum infection around the wisdom tooth. Nothing to be panic, if I am your treating doctor I would have suggested you to take topical antibiotics like metronidazole and topical analgesics like choline salicylate. Do not use hydrogen peroxide rather you can use warm salt water to gargle.
Regarding the bleeding from gums, it can be because of the gum infection secondary to deposits over the teeth. So you need to get the teeth cleaned. You don't have to worry about the heart disease. Bleeding gums is common feature in gum infection. So first you get your teeth cleaned, everything will be fine.
Heart attack cannot happen secondary to bleeding gums. There are chances of spread of infection from Oral cavity to heart in patients who have stents or pace makers(patients who have already have cardiac Diseases are more prone for the spread of infection from oral cavity to heart but not in normal individuals)
Regarding the XRAYS, there is lot of difference between regular sun rays and XRAYS in wavelength. The penetrating power of XRAYS is higher than the sunlight. The XRAYS do result in cancer of various parts of the body. But the XRAYS what we use to diagnose the disease has very minimal effect on the body that will not cause any damage to your body upto certain level.
CT of heart will not help you to diagnose your heart damage. Without any cardiac disease symptoms a person cannot advise CT scan.
You have to visit a good oral physician and get yourself examined properly and get the teeth cleaned first. If possible upload the images of the teeth and gums so that I can give you better diagnosis and treatment plan.
I hope I have answered your query. If you have any queries reply me back. Take care.