I had a stroke 3 years ago. I went from a size 20 to a size 12. I want a mommy makeover, arm lift, and BBL. Is it safe?

Combining multiple plastic surgery procedures into a single operation is common. The key to safety is making sure that the patients we operate on are healthy (we would get pre surgical clearance from your pcp) and not exceeding certain time frames. Typically I don’t offer surgeries that will take more than six hours to complete. A consultation is the place to start to learn more about what is possible for your anatomy and interests. Good luck!!

I am sorry to hear about the stroke you suffered; hopefully, you have fully recovered and are doing well.Generally speaking, combination surgical procedures are done routinely. However, you are wise in being concerned about the safety of combination surgery; risks/possible complications do increase with increased length of surgery… Careful evaluation of your past and current medical condition is necessary prior to determining your "suitability" for the procedures under consideration.   In your case, this "medical clearance" may be best obtained from your internist or neurologist. The physicians who know you best will be your best resource when it comes to answering the above question.
 Once you have obtained this "medical clearance", it will be important that you select your plastic surgeon carefully. During the consultation process, after a complete history and physical, the SAFETY of combining these surgical procedures becomes of paramount importance. Plastic surgeon, anesthesia provider, duration of surgery, surgery facility all important considerations. 
Again, your best bet: choose your plastic surgeon very carefully; everything else including good judgment/advice/planning, anesthesia provider and safe surgery facility will follow. Best wishes.