I have an umbilical hernia/diastasis/atrophy. Will a mini tummy tuck fix my belly? Scared of the scar and recovery. (photo)

From your photos you are a better candidate for a standard tummy tuck. Your c-section scar will be removed as part of the procedure and replaced by a new scar. I encourage you to begin by visiting with a board certified plastic surgeon near you for a consultation. Here you will learn more about the procedure, the results, and what you can expect from recovery.

A short scar TT (The shorter scar it leaves is the same length as that of the mini TT) tightens the muscles, and removes skin and fat. The incision is so low that bikinis may be worn afterwards. It creates a scar which is flat all the way across and is not a smiley face. This way the ends of the scar never rise above low cut clothing. The umbilical hernia can be repaired at the same time.
  
Generally, patients require only one or two weeks to recover. Patients are advised not to perform strenuous exercises for four to six weeks after the surgery.  Most PSs would recommend that you wait at least 6 weeks before lifting greater than 10 lbs.Pain control is important.  I typically use whatever medication a patient has used in the past that has had success.  If the patient has never had surgery or never used pain medication, I use oral narcotic meds of varying strengths.   I think that many patients require prescription pain medications for the first week or so with the transition to the use of Tylenol for the next week.

A mini tummy tuck can be done with complete repair of the muscle separation and the umbilical hernia using the umbilical float technique. Your existing C-section scar would be used, perhaps extended a  bit. there would not be much skin removal possible so minimal effect on stretch marks.