Sometimes hard to see the good side of things when you've constantly been dealt a shitty hand. I hope there's progress with improving your quality of life because that sounds rough af - I couldn't imagine having to deal with it myself.

A tolerance in this case would suggest that the body is no longer responding to the medicine and pain relief no longer being provided by it. In regards to impressed it's more that it worked the same amount and you just don't go "Wow!" anymore - it worked as you already knew it would.

Honestly if you've never done any of this before I'd get an electrician to do it. EV chargers are straight up fire hazards if not done properly - not to discourage you from DIY stuff but an inspector isn't going to check every connection.

There still needs to be GFCI separate from the charger itself to cut power in case it fails (interrupter installed at supply)

I don't believe the breaker on the panel counts as a disconnect but I'm not sure on that. However it must be able to be locked open (which a standard breaker cannot be) per rule 86-304.2c which pretty much requires a separate disconnect regardless with a residential panel as they'll use a removable cartridge.

I am not sure you are allowed to do the passthrough of the charger through the wall either but you'd have to ask an inspector on that one.

Sub panel is against code in this case as it allows other loads to be added to the circuit. In Canada it must be dedicated.

Editing myself: forgot you could just... you know, use the sub panel to provide the feed (which is allowed). The above info is incorrect, you can do Main -> Sub -> Charger.

Yup. Disconnect is required by code for 240V chargers.

BC electrician here.

If it's 6/3 It's most likely aluminum but if it's copper that's awesome (just not as common as the aluminum is way cheaper). I do not recommend downsizing the wire for the last two feet, get the same gauge if you need to extend it (or don't extend it at all - EVs have very high extended loads and splices aren't great for that).

You will need to validate the breaker is GFI equipped (rule 86-306). You will also need to install a disconnect for a 240V charger (rule 86-304) that is within sight of the charger - this would be the place to make a junction.

As a reminder an EV charging circuit cannot be used for anything else apart from ventilation (rule 86-300), which will be necessary per rule 26-506.