I know there are risks with vaccines and treatments, but in all honesty i'd rather take the small risk of a vaccine reaction or side effect than the much greater risk of my dog contracting parvo or similar when i could have done something to try prevent it. Parvo is very much still out there, in my area at least and it's been around the country quite a lot this year from what i've seen on other forums. Also i work in a kennels, and if i want to take my dog to work she has to be up to date with an annual vaccine. I would love to only vaccinate 3 yearly but would not be allowed to take her to work in an emergency if i did that.
I know in particular some pain releif treatment don't work for all dogs, particularly if they have kidney problems. and if i could find an alternative that worked for my animal i'd happily use it,same for any medication. I would go with whatever worked for my own dog, but i wouldn't automatically rule out painkillers if my dog was in pain, i would certainly try them short term to make my dog comfortable.
I would do the same for myself if i was in pain.
i can understand your reasoning tho,all i can do is put my trust in my vet,and make sure my dog is happy.