The 30-year-old "Orange Is The New Black" star took ill during a break in Ibiza with pals and has been told by doctors not to fly but Ruby got annoyed when fans questioned her illness.
She wrote: "It's upsetting to see people questioning me getting tonsilitis.. And cancelling 2 of 15 shows in a month... Off the back of filming a movie.
"But I don't party, I've not been to one club except when playing here and I've had a 3 day vacation with childhood friends I flew out.
"Lastly, I trained hard for 3 films and continue to train hard, more than ever in my life.. I'm fit (well before I got sick). Thats all. I dint care what 'people think' but I wanted to clear it up for the fans. However you should know me by now. Off socials again while I rest (sic).