struggling to take time off work, fear of presenting myself as incapable but Im burning out! Is it ok to take time off work?

My Main question is how often do you take personal days off work if ever? How much time off is too much and how do you know if you really need time off or you just need to work harder? its easy to feel like you need days off all the time but in reality most days are just hard but doable. Then you have days where you feel like you cannot do anything yet you still do. Can someone give me just another perspective on how you handle personal days, how you ask for them, how many days you take and if you feel that imposter syndrome too.

For Context if you would like to know.

Im 43 type 1 diabetic, Adhd and Level 1 autism with anxiety disorder that ranges from Moderate to High everyday. I work a 1099 Job doing Pharmacy deliveries and being that there is no sick pay or anything like that, Im expected to always be available for work. My work hours can be from 9:30am to sometimes 7-8pm and I struggle with hypoglycemia unawareness.

After multiple weeks of working and pushing through daily Hypoglycemic emergencies and overstimulated social interactions and driving (which I absolutley hate) I tend to burnout every single month but I never really take personal days off. I struggle to advocate for myself and I often just give in and do whatever work asks just to be compliant.

This week however was my burnout time and it coincided with multiple days of no sleep which lead to severe sleep deprivation and having to drive 200+ miles a day I found myself breaking down tonight. It felt like I all the sudden was extremely autistic and I realized I am way to burned out to keep pushing it.

HOWEVER I feel so uncomfortable or like a failure for taking a personal day but I feel I have to in order to recover. My Client knows my condition but they dont quite understand how difficult it is to manage these 3 conditions so when I have asked for time in the past they responded with comments like " Again, theres alwasy something wrong with you" or "we been having problems with you needing time off" so it makes me feel like I am wrong for trying to take care of myself.

Sometimes life just feels like constant struggle with no breaks, no calm, no peace and misunderstanding. It makes me resent living and dream of the day I can cease to exist.

With love and sincere compassion. Thank you and I hope you are able to have a good day, morning and life. :)