Hi I had gone through your problem. Already you had been told that you have gum problems i.e., gingivitis and receding gums. These problems will not cause white spots on the gums, which are painless. Second thing and important thing in your query is you deal with lot of stress daily. Because of that stress some kind of white spots which are pain less, may form not only on the gums but also on the entire mucosa of the oral cavity. I strongly suspect that white spots may be because of that stress. Any how you kindly visit the dentist one more time. If those spots are same what i suspected, then the treatment is required apart from stress relieving methods. I think my answer would satisfy your query.