1. She's never had a job.
You need to make sure this whole situation is taken care of before you get involved in a serious, invested relationship. If this is something that is more than just a pet peeve, and could possibly become a roadblock to your emotional relationship, then it's better to get this thing taken care of before it can really get messy. I suggest just telling her how this makes you feel as the sole provider of income and what (if anything) she can/is willing to do to remedy the situation.

2. She takes medication.
I'm going to be as blunt about this as I can: If you are willing to break off what could potentially be a beautiful relationship because she takes medication (for OCD, bi-polar, more or less ANYTHING, sans serious round-the-clock required medical treatment (maybe this is the reason for the caregiver)), then you are incredibly shallow person who does not deserve happiness, at least not this time around. Sorry, but bi-polar disorder is not terminal cancer, and if it makes you that uncomfortable that she has to take some pills every day to feel her best, then honestly, you're just a dick.

3. She could stand to lose a few pounds.
So could you, buddy, by your own admission, so I think this is a situation where you don't really have a leg on which to stand. If you're a health nut, and you go to the gym every day, getting sculpted abs/pecs, fitness is your life, then maybe this is really a dealbreaker to you. So be it. But it sounds like you're not really the kind of person who goes and works out every day (and if you started to, just to impress some chick, i'm sure you'd stop within a month or two), so I'm not really sure where you get the arrogance of thinking you can judge someone else because they aren't a hardbody 10/10. Obviously, she looked past YOUR chubby factor; I'm sure you could too. If it's really that big a deal to you, you could make a ritual or little thing to do when you're together -- you can go on runs or bike rides together.

So far, I'm not really sure any of these are valid 'dealbreakers', at least in my personal opinion. If these arguments ARE incredibly important to you, then maybe this ISN'T a situation you want to be involved in. However, I get a feeling that these are more pet peeves than really big deals to you, so maybe you could come up with some way to deal with these issues on your own or together, because it may not be totally smart to kill what potentially could be a great relationship because you have some personal baggage.

This is tangential (and anecdotal), but the most sane, reasonable, and emotionally stable girl I ever dated had depression and bi-polar disorder and took medication for both. If you can get past the stigma, you might be thankful for it a few weeks, months, or even years down the line.

Good luck.