I'm so sorry that you're in that position!
I feel you! I've recently been grounded from horses due to an injury... or two.... or three compounding. It's taken away my college (I've had to leave on deferment) which was a devestating blow, and now it's taken me away from my horse. I was already fretting about leaving her to go to college where I'll have no horses, and I don't think I'll be able to bring her up, and now for three months I've only been out to see her twice and it's killing me. Are there any trainers you could work with down there? I worked (and work) under a trainer where I board my horses and when I couldn't ride her due to her being underweight from her age the trainer worked it so that I could ride some of her personal/training mounts. Other boarders also let me ride theirs. Up in the town I was moving to that's where I started to look. I'm sure if you put yourself out there someone will need a horse worked or be willing to share! As for your dad: do what you love to do, it's your life. I'm not in your position so I won't tell you do X or Y or Z, but my dad sorta did the same thing after I got injured and for a few weeks things were rocky, and then I told him to back off because no matter how many times I got hurt I was always going to be back on the horses. I hope everything works out soon!