There should be no significant contraindication to Coolsculpting. Generally, after surgery, it can take up to a full year for the incisions to regain full strength. A hernia in the incision would be a contraindication. The lymph node drainage is a redundant system and shouldn't be a problem if you aren't having any problems with it now. I would recommend that you contact a Coolsculpting specialist to get a thorough evaluation.
The concern would be that you could develop a hernia through one of the incision sites. Although they are small, it still takes time for the strength layer, that is called the fascia, to heal. A wound can take up to a year to regain its maximal strength. Therefore, I would recommend waiting 12 months before performing Coolsculpting over a surgical incision.
Botox is a temporary relaxer of wrinkles that has an expected length of action on the face of 3-4 months. It works by paralyzing the muscles of the face, and therefore can cause those muscles to temporarily lose function. Any effects are temporary, and the function of the muscles should return to normal once the effects have worn off. However, it is impossible to tell whether the symptoms that you are noticing are related to the Botox or some other cause without knowing the details of the injections. I would suggest that you follow up with your provider to review your concerns.
As a practical matter, a Coolsculpting cycle is considered irreversibly underway after 5 minutes-so the option is to repeat the cycle or not. While 16 minutes may give adequate treatment, ideally, the area should be treated for the full cycle. Allergan is very responsive--and so if there is an incomplete cycle, your provider can discuss getting that incomplete cycle repeated. Theoretically, the full treatment would be the ideal time to allow for adequate freezing of the fat tissue--and combining shorter cycles will not give the same cumulative effect as a full cycle.