low carb on pump

I have lost over 24 pounds via low carb had to put my insulin pump on I got a surgery date, am I doing whats right? I am sort of thrown not knowing if this is right. I was doing good from feb 9th till past few days I feel sick had to put pump on with insulin I feel awful.will this go away? I am 57 I am hypothyroid on blood pressure med, Water pill, I am on med for cholesterol zetia, anxiety, pain meds, muscle relaxers, med for anxiety, klonopin. now with the insulin pump on I am scred of gaining weight I lost, I was told at srat of vsg no diet but not to gain over 257 or no surgery, I lost to 233, now I am having issues. I have had no endo for several motnths to help me with my thyroid and my insulin . so I have had to do this my own way, my primary care has to clue how to treat me . I fel just lost and throwm

n out to fin for myself. I want to know if I should proceed with the vsg surgery or to cancel it!!!!