Surgery - Colorectal. In brief: Yes, most docs can. Most hemorrhoids should first be treated by conservative measures, such as bulking the stools, education to avoid bad habits like straining, sitting for long periods of time, etc.
Either system will have a burner. 23 years may very well be beyond the typical life expectancy of a oil burner, but a furnace or boiler should last considerably longer than 23 years. The boiler of my house here in MA is 58 years old and still works fine. I am starting to consider replacements, however.
Air conditioners and heat pumps last an average of 10 to 12 years, while furnaces have a life span of around 15 to 20 years. If your equipment is within those ranges, expect more repairs in the near future. Technology changes all the time. This is as true for your heating and cooling system as it is for your phone.