Be a little cautious, Dreamer. My wife convinced me to go to a counselor, who was an MSW. But he knew little--and wanted to treat me for sexual addiction. I looked up the large institution where he was one of many counselors and psychologists. Dozens of their counselors list many "specialties" with "sexual identity issues" among them, but when you read details of their backgrounds they seldom mention such experience. Beware of exaggerated claims.
Get a referral from someone who knows, or from a local support group. For instance I am looking at an ad for a mental health professional LMSW in a magazine put out by our local Network LBGT group. It lists "sexual identity issues" as the first in a of list of "I can help:" topics.
Go through the online information to glean any information you can about your therapist.