Myth: I cannot get or maintain my security clearance if I am diagnosed with PTSD. Fact: Getting treatment for PTSD is not necessarily a threat to an individual’s security clearance. In fact, mental health counseling can be a positive factor in the clearance process.3 Army records show that 99.98 percent of cases with psychological concerns obtained/retained their security clearance.4 Additionally, service members are not required to report some treatments, including those for PTSD, they received due to service in the military when they apply for a security clearance.5 Factors that could result in clearance refusal include not meeting financial obligations, criminal actions or engaging in activities benefiting a foreign nation.3
I guess it depends on your job and what your clearance is for, if you're PRP I would assume you will lose your PRP but might keep your clearance although it might be suspended. I work F22's and it doesn't take much for clearances to be put on hold or suspended, the best bet is to talk to your security manager off the record.