Thanks for your query, I have gone through your query.
The decay below the crwon extending into the root cannot be saved. Consult a oral maxillofacial surgeon and get it removed, Before going for extraction get your blood pressure and RBS checked(considering your age). If the BP and RBS is under normal limits then get the tooth removed. If the blood pressure is high then you can consult a physician and take anti hypertensives and later get the tooth removed once the BP comes to normal.
I hope my answer will help you, take care.

Hello,
An infected tooth can be extremely painful and usually requires treatment with an extraction or root canal therapy. To control your immediate discomfort, I would prescribe an antibiotic such as amoxicillin and suggest that you take anti-inflammatory medication. I suggest, if possible, take two extra strength Tylenol and two Advil at regular intervals to control your pain level. Your blood pressure will increase with a higher pain level and should be reduced with some relief. Blood pressure must be under control before considering an extraction procedure. Infections must be treated to prevent spreading and stress on your entire body. Attempt to control your blood pressure with a proper diet, reduce salt intake and good habits until you determine if medication is necessary to maintain proper blood pressure. Check your blood pressure on a regular basis and record your results. Discuss all concerns with your physician and dentist before the extraction procedure to avoid complications.
Thank you for your inquiry. I hope my suggestions will help you feel better and help you return to good health.