How can I pursue a discrimination lawsuit against a corporation's local store?

I've been going to Walgreens at 400 Atlantic City Boulevard in Bayville NJ for years, both to fill my prescription pain medications for my cerebral palsy and multiple sclerosis, and for my normal shopping habits. On September 21, 2016 from approximately 5:00 to 9:00 PM, my (also disabled) girlfriend and I had to endure being questioned by two different sets of 3 cops because an employee said we had heroin needles hanging out of our arms (we didn't, that destroyed us), my girlfriend was asked to strip off articles of clothing for these claims, and since we were there for an extended period because of car troubles, we were told someone called AGAIN because we were "making them uncomfortable", when all we were doing was standing by our car. There's more to this story and I'd like to discuss this with a lawyer.