Hi there, Thanks for your time. i have a question regarding my Root Canal.

I did my Root canal, back in Dec 2012. After doing that there was some pain and sensitivity, after some days, it went off as my dentist said. But now, sometimes i feel like some water or blood( not sure, it tastes salty), and i don't know whether its coming out of gum or the same root canal tooth. I am afraid to go and check with my dentist, because for every visit they charge me 100$. i cant afford a lot, i am waiting for my crown appointment .. dental services are very expensive here in Canada. Can you please tell me from your experience what that would be ?

Another question too, my dentist told me that i have a cavity formation on other tooth too, but i don't feel the pain or anything on that tooth. that like normal, what should i do, in order to save it and stop that cavity ? i don't have money for another root canal.
Thanks for your help and time.