Hi Jan.
Seems like your going through what many have already gone through--difference, you've put Pen to Paper--or these days Fingers to Keyboard. That's a good thing, already it'll help other's that are in the same boat, realise there not alone.
Maybe a visit to your local support group might help--take John along also.
They should be open to Carers, Partner's & Family Members.
Personally, I'd use my GP, as a last resort. (shall not say why, but if you want to know, just pm me.)
Sounds like your Family are in Denial of what you've going and been through.
Maybe they can't come to terms with what's happened, they need to be sat down and told.
That's easier said than done--I know that for a fact!!
You've stated that you've been arguing a lot more lately, bet this is down to frustration, and depression.
Think a lot of us have been there.
Stay Strong, Stay Positive, never think your ranting on here--Advocacy & Empathy is plentiful, it's FREE, and no Appointments Needed.
Take care