I would not move on but I would try to make it a workable environment. The probability that a job change will results in a 30 dollar an hour cut should be a powerful motivator to improve the work relationships. Sometimes that takes a little effort in winning over a few MAs. Everyone wants to be appreciated, maybe buy pizza on a stressful night or bring bagel/donuts and when you see somebody doing something helpful ... make sure to appreciate that. Should you have to buy food ? No, but having a positive working environment is more important to me than being right.
I would also address the issue of the MA who won't work with you with the manager. that is ridiculous and that type of attitude creates a hostile environment.
Lastly , you're best off not treating co-workers or friends. however, sometimes situations arise........My rule of thumb if I choose to help is to have them send me a communication with our patient /provider messaging system and then within that documentation I order the medication and document the assessment/interaction along with the instructions I provided them for follow up. I regularly read the quarterly board of nursing in my state, and where I practice, no having a documented assessment/plan of care....is usually where people get in trouble