My hot end is fubar  

My hot end is fubar

Background first.
I've had this printer since January and have had good times printing with it. I clean the nozzle and bed everytime I start a new print, and only in the week before was when I started having weird clogging issues.

About a month ago I tried to replace the default nozzle on the Prusa MK3 with some other generic ones I found online for the E3D in the hopes of solving this issue and also trying to print more detailed, prints.

However I have yet to get a chance to see if they even fit because when I was trying to remove the default .4mm nozzle it broke off and the threading stayed inside. I followed the process as outlined by this video .

I tried to do this myself. I bought a 50$ bolt extractor kit and decided I could still use the block, but I didn't bother to remove any of the cables attached because I was nervous to. I'm concerned I broke either the thermistor or the heat cable attached to the heater block because when I tried to go back and preheat the printer for 280*C the printer only heated up to 182C, instead of 280C. It did say heat temp error and then went into cooldown after, but I am unsure what that means.

Now I have a heat block with an extractor end ALSO broken off inside the part and I have no idea how I'm going to salvage this. Right now I'm going to try buying a new heat block, but I need advice on what to buy or what I can do to trouble shoot the cables attached to my damaged heatblock.

Do you think I need a new thermistor and heater cartridge cable, in addition to a new heat block? If so, does this part come with everything I need to start printing again? The thermistor and the heater cartridge? https://shop.prusa3d.com/en/mk3-and-mk3s-printer-parts/208-mk3-e3d-v6-hotend-assembled.html

I really wanted to do this DIY myself but I don't want to spend another 50-70$ on a workaround when at that price I could've just bought a new E3D hotend.