I’m sorry that you’ve been diagnosed with both TOS & ES, that is rough! I hope that the next surgery will be successful & will give you better health… we do often find that members don’t feel the full benefits of ES surgery until both sides are done unfortunately. The vagus nerve is often affected & is next to the styloids, in the carotid sheath along with the ICA & IJV I believe, so this could be causing you issues… Do you mean that you have more tension in your muscles & that’s causing you issues? If so lots of members find that posture, pain & guarding of muscles caused by ES pain & inflammation can cause issues with muscles not just in the neck & shoulders but throughout the whole body, it’s amazing the ripple effect ES can have. There have been quite a few discussions on this, & some members have found that it can take months of targetted gentle exercises & PT to begin to undo all the ‘damage’ which has been done, here’s one discussion which might be helpful:
List of my favourite resources on YouTube to learn anatomy - General - Living with Eagle
Who is your surgeon? Is it Dr Costantino? I’m trying to be encouraging, but also realistic as you may not get instant relief after surgery, will pray for your surgery & sending you a hug 
