i got into an argument with my boss a month ago and im taking sick leave next week - i feel like her plan is to fire me behind my back while im out recovering from a surgery. she's very passive aggressive and I've tried asking her about this directly but she didn't explicitly tell me 'no, you're not getting fired', she just said 'hahahahaha you're reading too much into this'. 
i'm so stressed about it my stomach hurts. my entire savings plus a sizeable bank loan are going towards paying for my surgery out of pocket because insurance doesn't cover it. if I get fired, I will not only not be able to make my rent, I won't be able to pay back my loan and will probably get arrested or something.

i feel so stressed and bad about this that i'm having chest pains. i wish I could bring this up with my boss honestly and openly but she does everything under the table/sneaky/passive aggressively and even if she outright told me I have nothing to worry about, I wouldn't be 100% reassured. 

what do i do?