It's a tough one. Not something I've been through and I understand why you're anxious about the money. But equally, is there any point forcing yourself to complete a course which maybe wasn't for you anyway. I've struggled with mental health issues in the past too. I considered taking a gap year to take a breather and assess my options, but decided against it because I knew I'd end up really lonely and depressed. So if you are going to change route, try and make as clear a plan as possible because if you're anything like me, you'll end up off course soon enough.
I know it's not what you want to hear, but talk to as many people as you can that you really trust. I'm really rubbish at talking about my problems because I'm so insecure (which is why I end up posting on here, let's be honest). Like you say, you're not academically incapable, you still have options. I think sometimes being intelligent enough to have a lot of options can make it hard to feel that you've ever settled for the right thing. Do some research into other options (working, apprenticeship). Sadly, it doesn't look good if you drop out, so you need to try stick at uni, I'd say.
Go for the appeal, so that you're fully aware of your options- especially try and make them hear you out with regards to the problems you've had this year. Good luck