I, too, would like to know more about your goals, which would help me provide more tailored advice.
That said, I am going to assume, at some point, you would like to be more financially secure and eventually financially independent.
First, income: You are doing okay on your current income, but an increase would certainly be helpful. Are there side hustles you can pick up, a raise you can ask for (because you have earned it or because you take on more responsibility), or other jobs that are also close to your home that you could apply to? Increasing income even 5k would be hugely helpful.
Expenses:
$290 cash to blow - Nope, not allowed when you have debt and very little savings. Give yourself $25 in cash and try not to spend any of it unless a legit emergency. Put first towards cc, you will have it paid off in 2 more months.
$589 towards VISA card - This obviously sucks, but you must cut up the card immediately and remove it from your home so you do not use it any more. Pay it off and then immediately take $600 and start saving it (then, investing it) monthly to support you financial security.
$50 the phones (punch me now for my 2 phones) - consider yourself punched, this is completely stupid. Cancel one immediately and sell it on gazelle.com to get a few bucks. Put extra money towards your emergency fund, and then your investments (401k or start and IRA)
$93 auto insurance and insulin pump insurance - This seems expensive, do yourself a favor by shopping around. I pay just a little more and have more vehicles.
$92 groceries - this seems low to me, as others have noted. Is it being subsidized by eating out somehow?
$120 gasoline - this seems insanely high. Cut down on your driving yesterday. Let yourself do one fill up each month and no more, this is seriously insane.
There are some categories that I don't see....do you not buy any clothing? Any gifts? No entertainment? Property taxes? Car registration? If so, good for you, but I find that many people have hidden expenses they don't account for in budgeting and get really surprised when those expenses arise / don't know how much they are spending there.
Get your emergency fund / medical fund up to about $3k and then from there, just keep contributing the $400 monthly for your medical. Divert other resources into the market.
How much do you have invested in the market already via 401k? Are you comfortable that you have that invested in the smartest, low fee fund?
Good luck and try not to get discouraged, you are doing what you can control in saving money to address your medical needs. You should feel good about that. Please keep us updated!