If your birds survive, they will be carriers for life. You must maintain a closed flock. No new birds in, no birds out and no hatching eggs to be given away or sold.
You want to experiment with natural products to build immunity in your birds during times of stress. There have been millions and millions of dollars spent trying to treat and cure mycoplasma diseases using all kinds of products, both natural and man made without success. The only cure is to cull suffering sick birds, disinfect everything and start over a couple weeks later. Check with your vet, he'll tell you the same thing if he hasnt already done so.
X2. I regret to say dawg is right, vicChickenLover. You can possibly overcome symptoms with the appropriate antibiotics, but stress in the future could bring symptoms back and you will have to treat them again. If you wish to keep them and try to give them life, you will have to keep the flock closed to any other birds.