Just got a filling instead of root canal...?

so not been dentist for a LONG time yep had the lecture today and feel adeqately scorned and stupid..... anyway a tooth chipped so i had a temp filling 4 weeks ago had no pain/infection etc just a cusp broke off my back lower molar. anyway today after my telling off my dentist cleaned my teeth for me :) and then removed my temp filling as well as the amalgam one that was in the same broken tooth and then said the decay was "quite deep" and may need a root canal but once she got in there she said i could chance a filling or go for the root canal being agorophobic as well as not to fond of the dentist i obviously opted for the filling she said it had a 50/50 chance shes put what i think is a clove oil cotton wool ball in there as that is all i can taste! and then put a white temp filling on top and sent me on my merry way she says if i have no pain in the next two weeks when i go back on the 16th june she will put a permanent filling and that will be that. what im now wondering tho is should i have just had the root canal done are these type of fillings successful? i havent had any pain so far..... she said there was no infection just that the decay was close to the nerve..... am scared im going to get pain and knowing my luck it will be a friday night or saturday morning when my dentist isnt open until monday..... would love some advice from a dentist or anyone else thats had this done and it worked or unfortunately didnt work... thanks in advance