Hair fall after 10 months of FUE hair transplant. Is it OK??

In late December, 2014, I had FUE hair transplant of 2500 hair grafts. Due to some office problems, I am having some stress (normal tension) and facing hair fall of my transplanted hairs. Every 2nd day when I use shampoo, 12-15 hairfall and on daily basis whn moving my hands on my hair, again I get 10-12 hair on my hands. Is it normal? I want to ask if these hair will come back. What can I do to stop this hairfall. Can I use medications for temporary basis. Im still using Minoxidil 5%. thanks